View Filing Data

Investments (Details 2) - USD ($)	Mar. 31, 2013	Dec. 31, 2012
Corporate Secturities by Investment Sector And Credit Rating [Line Items]
Available For Sale Securities Amortized Cost	$ 11,464,082,000	$ 11,333,431,000
Available For Sale Securities Fair Value Disclosure	$ 12,441,501,000	$ 12,380,071,000
Percentage Of Total Available For Sale Securities	100.00%	100.00%
Finance Industry [Member]
Corporate Secturities by Investment Sector And Credit Rating [Line Items]
Available For Sale Securities Amortized Cost	$ 3,693,500,000	$ 3,619,455,000
Available For Sale Securities Fair Value Disclosure	$ 3,978,979,000	$ 3,900,152,000
Percentage Of Total Available For Sale Securities	32.00%	31.50%
Industrial [Member]
Corporate Secturities by Investment Sector And Credit Rating [Line Items]
Available For Sale Securities Amortized Cost	$ 5,977,146,000	$ 5,881,967,000
Available For Sale Securities Fair Value Disclosure	$ 6,480,028,000	$ 6,443,846,000
Percentage Of Total Available For Sale Securities	52.10%	52.00%
Utility Industry [Member]
Corporate Secturities by Investment Sector And Credit Rating [Line Items]
Available For Sale Securities Amortized Cost	$ 1,763,573,000	$ 1,799,658,000
Available For Sale Securities Fair Value Disclosure	$ 1,951,839,000	$ 2,002,611,000
Percentage Of Total Available For Sale Securities	15.70%	16.20%
Other Industry [Member]
Corporate Secturities by Investment Sector And Credit Rating [Line Items]
Available For Sale Securities Amortized Cost	$ 29,863,000	$ 32,351,000
Available For Sale Securities Fair Value Disclosure	$ 30,655,000	$ 33,462,000
Percentage Of Total Available For Sale Securities	0.20%	0.30%

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

+ References + Details

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)	Mar. 31, 2013	Dec. 31, 2012
Fixed Maturity Securities [Abstract]
Available-for-sale at fair value	$ 22,401,659,000	$ 22,291,614,000
Mortgage loans on real estate	2,325,191,000	2,300,587,000
Policy loans	1,245,812,000	1,278,175,000
Funds withheld at interest	5,698,594,000	5,594,182,000
Short-term investments	180,707,000	288,082,000
Other invested assets	1,129,651,000	1,159,543,000
Total investments	32,981,614,000	32,912,183,000
Cash and cash equivalents	1,001,841,000	1,259,892,000
Accrued Investment Income	230,269,000	201,344,000
Premiums receivable and other reinsurance balances	1,259,281,000	1,356,087,000
Reinsurance ceded receivables	602,373,000	620,901,000
Deferred policy acquisition costs	3,545,063,000	3,619,274,000
Other assets	576,660,000	390,757,000
Total assets	40,197,101,000	40,360,438,000
Liabilities and Stockholders Equity
Future policy benefits	11,355,882,000	11,372,856,000
Interest-sensitive contract liabilities	13,141,402,000	13,353,502,000
Other policy claims and benefits	3,243,948,000	3,160,250,000
Other reinsurance balances	250,606,000	233,630,000
Deferred income taxes	2,105,391,000	2,120,501,000
Other liabilities	877,405,000	742,249,000
Long-term debt	1,815,392,000	1,815,253,000
Collateral finance facility	491,987,000	652,010,000
Total liabilities	33,282,013,000	33,450,251,000
Stockholders Equity:
Preferred stock (par value $.01 per share; 10,000,000 shares authorized; no shares issued or outstanding)	0	0
Common stock (par value $.01 per share; 140,000,000 shares authorized; shares issued: 79,137,758 at March 31, 2013 and December 31, 2012)	791,000	791,000
Additional paid-in-capital	1,765,255,000	1,755,421,000
Retained earnings	3,521,492,000	3,357,255,000
Treasury stock, at cost	(349,190,000)	(312,182,000)
Accumulated other comprehensive income	1,976,740,000	2,108,902,000
Total stockholders equity	6,915,088,000	6,910,187,000
Total liabilities and stockholders equity	$ 40,197,101,000	$ 40,360,438,000

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Comprehensive Income Net Of Tax Abstract
Net income	$ 185,535,000	$ 123,318,000
Other Comprehensive Income Loss Net Of Tax Period Increase Decrease Abstract
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax	(14,105,000)	24,080,000
Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax	(119,333,000)	(35,415,000)
Change In Other Than Temporary Impairment Losses Recognized In Other Comprehensive Income	451,000	4,694,000
Other Comprehensive Income Amortization Of Defined Benefit Plan Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Of Tax	825,000	290,000
Total other comprehensive income	(132,162,000)	(6,351,000)
Comprehensive income	$ 53,373,000	$ 116,967,000

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 8, 9, 10, 11, 12, 13, 14
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 30
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph A5
-Appendix A

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e557-108580

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Net Income
-URI http://asc.fasb.org/extlink&oid=6518256

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Other Comprehensive Income
-URI http://asc.fasb.org/extlink&oid=6519514

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e540-108580

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Comprehensive Income
-URI http://asc.fasb.org/extlink&oid=6508144

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(3)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 87-21
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 10, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28, 29, 30
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 5
-Section 03
-Paragraph 19

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 20
-Article 9

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Net Income
-URI http://asc.fasb.org/extlink&oid=6518256

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Other Comprehensive Income
-URI http://asc.fasb.org/extlink&oid=6519514

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.18)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.19)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e565-108580

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.22)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph A7
-Appendix A

+ Details

- Definition

The adjustment out of other comprehensive income for prior service costs recognized as a component of net period benefit cost during the period, after tax.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 7
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 4
-Subparagraph c, d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 17, 19, 24
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 106
-Paragraph 52
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e637-108580

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e653-108580

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(3)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

Change in the balance sheet adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into functional currency of the reporting entity for the period being reported, net of tax. If an entity's functional currency is a foreign currency, translation adjustments result from the process of translating that entity's financial statements into the reporting currency. Includes gain (loss) on foreign currency forward exchange contracts. Includes foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements. Includes the gain (loss) on a derivative instrument or nonderivative financial instrument that may give rise to a foreign currency transaction gain (loss) and that have been designated and have qualified as hedging instruments for hedges of the foreign currency exposure of a net investment in a foreign operation.

+ References

+ Details

- Definition

This element represents Other Comprehensive Income or Loss, Net of Tax, for the period. Includes deferred gains or losses on qualifying hedges, unrealized holding gains or losses on available-for-sale securities, minimum pension liability, and cumulative translation adjustment. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

+ References

+ Details

- Definition

Appreciation or loss in value (before reclassification adjustment) of the total of unsold securities during the period being reported on, net of tax. Reclassification adjustments include: (1) the unrealized holding gain (loss), net of tax, at the date of the transfer for a debt security from the held-to-maturity category transferred into the available-for-sale category. Also includes the unrealized gain (loss) at the date of transfer for a debt security from the available-for-sale category transferred into the held-to-maturity category; (2) the unrealized gains (losses) realized upon the sale of securities, after tax; and (3) the unrealized gains (losses) realized upon the write-down of securities, after tax.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 13
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 24
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 17, 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e637-108580

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e653-108580

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=6920433&loc=d3e998-108581

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(3)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Investments (Details 18) - USD ($)	3 Months Ended
Investments (Details 18) - USD ($)	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Financing Receivable Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	$ 41,777,000		$ 40,566,000
Impaired Financing Receivable Recorded Investment	41,167,000		39,956,000
Impaired Financing Receivable Related Allowance	6,008,000		6,980,000
Impaired Financing Receivable Net Of Related Allowance	35,159,000		32,976,000
Impaired Financing Receivable, Average Recorded Investment	46,101,000	$ 36,057,000
Impaired Financing Receivable Interest Income Accrual Method	570,000	234,000
Commercial Real Estate Other Receivable With No Related Allowance [Member]
Financing Receivable Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	14,802,000		13,039,000
Impaired Financing Receivable Recorded Investment	14,259,000		12,496,000
Impaired Financing Receivable Related Allowance	0		0
Impaired Financing Receivable Net Of Related Allowance	14,259,000		12,496,000
Impaired Financing Receivable, Average Recorded Investment	11,054,000	4,706,000
Impaired Financing Receivable Interest Income Accrual Method	109,000	32,000
Commercial Real Estate Other Receivable With Related Allowance [Member]
Financing Receivable Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	26,975,000		27,527,000
Impaired Financing Receivable Recorded Investment	26,908,000		27,460,000
Impaired Financing Receivable Related Allowance	6,008,000		6,980,000
Impaired Financing Receivable Net Of Related Allowance	20,900,000		$ 20,480,000
Impaired Financing Receivable, Average Recorded Investment	35,047,000	31,351,000
Impaired Financing Receivable Interest Income Accrual Method	$ 461,000	$ 202,000

Segment Information (Details 1) - USD ($)	3 Months Ended
Segment Information (Details 1) - USD ($)	Mar. 31, 2013	Mar. 31, 2012
Segment Income Loss From Continuing Operations Before Provision For Income Tax [Line Items]
Income Loss From Continuing Operations Before Provision For Income Tax Segment	$ 278,827,000	$ 180,763,000
US Segment Reporting Information [Member]
Segment Income Loss From Continuing Operations Before Provision For Income Tax [Line Items]
Income Loss From Continuing Operations Before Provision For Income Tax Segment	174,409,000	92,745,000
Canada Segment Reporting Information [Member]
Segment Income Loss From Continuing Operations Before Provision For Income Tax [Line Items]
Income Loss From Continuing Operations Before Provision For Income Tax Segment	36,308,000	55,063,000
Europe And South Africa Segment Reporting Information [Member]
Segment Income Loss From Continuing Operations Before Provision For Income Tax [Line Items]
Income Loss From Continuing Operations Before Provision For Income Tax Segment	17,385,000	6,606,000
Asia Pacific Segment Reporting Information [Member]
Segment Income Loss From Continuing Operations Before Provision For Income Tax [Line Items]
Income Loss From Continuing Operations Before Provision For Income Tax Segment	14,518,000	32,067,000
Corporate And Other Segment Reporting Information [Member]
Segment Income Loss From Continuing Operations Before Provision For Income Tax [Line Items]
Income Loss From Continuing Operations Before Provision For Income Tax Segment	$ 36,207,000	$ (5,718,000)

Earnings Per Share

3 Months Ended

Mar. 31, 2013

Earnings Per Share [Abstract]

Earnings Per Share

2. Earnings Per Share

The following table sets forth the computation of basic and diluted earnings per share on net income (in thousands, except per share information):

			Three months ended
		March 31,
			2013		2012
Earnings:
	Net income (numerator for basic and diluted calculations)	$	185,535	$	123,318
Shares:
	Weighted average outstanding shares (denominator for basic calculation)		73,838		73,575
	Equivalent shares from outstanding stock options		551		468
	Denominator for diluted calculation		74,389		74,043
Earnings per share:
	Basic	$	2.51	$	1.68
	Diluted	$	2.49	$	1.67

The calculation of common equivalent shares does not include the impact of options having a strike or conversion price that exceeds the average stock price for the earnings period, as the result would be antidilutive. The calculation of common equivalent shares also excludes the impact of outstanding performance contingent shares, as the conditions necessary for their issuance have not been satisfied as of the end of the reporting period. For the three months ended March 31, 2013, approximately 1.5 million stock options and approximately 0.9 million performance contingent shares were excluded from the calculation. For the three months ended March 31, 2012, approximately 1.4 million stock options and approximately 0.7 million performance contingent shares were excluded from the calculation.

Fair Value Disclosures (Details 2) - USD ($)	3 Months Ended
Fair Value Disclosures (Details 2) - USD ($)	Mar. 31, 2013	Mar. 31, 2012
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value, Level 1 to level 2 Transfers, Amount	$ 0	$ 0
Fair Value, Level 2 to level 1 Transfers, Amount	14,012,000	4,000
Availableforsale Securities Member
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value, Level 1 to level 2 Transfers, Amount	0	0
Fair Value, Level 2 to level 1 Transfers, Amount	14,012,000	4,000
Corporate Debt Securities Member \| Availableforsale Securities Member
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value, Level 1 to level 2 Transfers, Amount	0	0
Fair Value, Level 2 to level 1 Transfers, Amount	$ 14,012,000	$ 4,000

Employee Benefit Plans (Narrative Details)	3 Months Ended
Employee Benefit Plans (Narrative Details)	Mar. 31, 2013 USD ($)
Employee Benefit Plans [Abstract]
Defined Benefit Plan Contributions By Employer	$ 0
Defined Benefit Plan Estimated Future Employer Contributions In Current Fiscal Year	$ 6,400,000

Investments (Details 15) - USD ($)	Mar. 31, 2013	Dec. 31, 2012
Financing Receivable Recorded Investment Aging
Total mortgage loans	$ 2,335,115,000	$ 2,312,167,000
Mortgage Receivables Member
Financing Receivable Recorded Investment Aging
Financing Receivable Recorded Investment 30 To 59 Days Past Due	6,594,000	7,504,000
Financing Receivable Recorded Investment 60 To 89 Days Past Due	0	0
Financing Receivable Recorded Investment Equal To Greater Than 90 Days Past Due	8,342,000	16,886,000
Total past due	14,936,000	24,390,000
Financing Receivable Recorded Investment Current	2,320,179,000	2,287,777,000
Total mortgage loans	$ 2,335,115,000	$ 2,312,167,000

- Definition

Reflects the sum of the gross carrying amounts of unpaid loans issued to businesses to acquire, develop, construct, improve, or refinance land or a building. Includes [but is not limited to] commercial mortgage loans, which are secured by a [legal] security interest in real property [commercial building or business real property] which thereby serves as collateral securing repayment of the loan; and construction financing, which is an obligation generally in the form of a [promissory] note, used for the funding of construction projects.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 60
-Paragraph 47
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 01-6
-Paragraph 13
-Subparagraph e
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 9
-Section 03
-Paragraph 7
-Subparagraph a

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Audit and Accounting Guide (AAG)
-Number AAG-DEP
-Chapter 8
-Paragraph 51, 52, 53
-IssueDate 2006-05-01
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5066-111524

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(a))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(c))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

Employee Benefit Plans

3 Months Ended

Mar. 31, 2013

Employee Benefit Plans [Abstract]

Employee Benefit Plans

9. Employee Benefit Plans

The components of net periodic benefit costs for the three months ended March 31, 2013 and 2012 were as follows (dollars in thousands):

	Pension Benefits				Other Benefits
	Three months ended March 31,				Three months ended March 31,
	2013		2012		2013		2012
Net periodic benefit cost:
Service cost	$	1,883	$	1,532	$	410	$	279
Interest Cost		1,018		980		312		259
Expected return on plan assets		(767)		(734)		--		--
Amortization of prior service cost		94		99		--		--
Amortization of prior actuarial loss		837		275		186		88
Total	$	3,065	$	2,152	$	908	$	626

The Company has not made any pension contributions during the first three months of 2013, but expects to make total pension contributions of $6.4 million in 2013.

- Definition

The entire disclosure for pension and other postretirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph h
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph q
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 8
-Subparagraph m
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 106
-Paragraph 518
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 03-2
-Paragraph 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 30
-Paragraph 26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS106-2
-Paragraph 20, 21, 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 7, 21, 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5, 6, 7, 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Implementation Guide (Q and A)
-Number FAS88
-Paragraph 63
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-URI http://asc.fasb.org/topic&trid=2235017

+ Details

Fair Value Disclosures (Details) - USD ($)	Mar. 31, 2013	Dec. 31, 2012
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	$ 22,401,659,000	$ 22,291,614,000
Funds withheld at interest embedded derivatives	(156,189,000)	(243,177,000)
Short-term investments	157,281,000	239,131,000
Other invested assets	405,421,000	419,861,000
Cash and cash equivalents	367,876,000	575,864,000
Total Assets	23,176,048,000	23,283,293,000
Liabilities Fair Value Disclosure
Interest-sensitive contract liabilities - embedded derivatives	890,476,000	912,361,000
Other liabilities	18,604,000	31,652,000
Total Liabilities	909,080,000	944,013,000
Interest Rate Swap Member
Liabilities Fair Value Disclosure
Other liabilities	1,463,000	196,000
Credit Default Swap Member
Liabilities Fair Value Disclosure
Other liabilities	(120,000)	1,953,000
Currency Swap Member
Liabilities Fair Value Disclosure
Other liabilities	10,687,000	27,398,000
Equity Securities Other Member
Liabilities Fair Value Disclosure
Other liabilities	(440,000)
Forward Contracts Member
Liabilities Fair Value Disclosure
Other liabilities	7,014,000	2,105,000
Nonredeemable Preferred Stock Member
Assets Fair Value Disclosure
Other invested assets	84,111,000	74,841,000
Equity Securities Other Member
Assets Fair Value Disclosure
Other invested assets	136,554,000	147,859,000
Future Member
Assets Fair Value Disclosure
Other invested assets	0	0
Interest Rate Swap Member
Assets Fair Value Disclosure
Other invested assets	83,662,000	104,972,000
Forward Contracts Member
Assets Fair Value Disclosure
Other invested assets	0	1,017,000
Credit Index Product Member
Assets Fair Value Disclosure
Other invested assets	945,000	1,446,000
Credit Default Swap Member
Assets Fair Value Disclosure
Other invested assets	(3,391,000)	(1,741,000)
Equity Swap Member
Assets Fair Value Disclosure
Other invested assets	54,351,000	62,514,000
Currency Swap Member
Assets Fair Value Disclosure
Other invested assets	140,000	0
Securities Pledged As Collateral Member
Assets Fair Value Disclosure
Other invested assets	25,790,000	17,002,000
Other [Member]
Assets Fair Value Disclosure
Other invested assets	7,205,000	11,951,000
Interest Rate Options [Member]
Assets Fair Value Disclosure
Other invested assets	16,054,000
Corporate Debt Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	12,441,501,000	12,380,071,000
Canadian Provincial Governments [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	3,942,198,000	4,049,334,000
Residential Mortgage Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,076,770,000	1,042,064,000
Asset Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	756,544,000	691,555,000
Commercial Mortgage Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,698,144,000	1,698,903,000
US Treasury And Government Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	331,201,000	265,190,000
US States And Political Subdivisions Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	313,097,000	302,498,000
Other Foreign Government, Supranational And Foreign Government-Sponsored Enterprises
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,842,204,000	1,861,999,000
Fair Value Inputs Level 1 Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	598,605,000	533,349,000
Funds withheld at interest embedded derivatives	0	0
Short-term investments	118,621,000	178,923,000
Other invested assets	231,323,000	225,401,000
Cash and cash equivalents	367,876,000	575,864,000
Total Assets	1,316,425,000	1,513,537,000
Liabilities Fair Value Disclosure
Interest-sensitive contract liabilities - embedded derivatives	0	0
Other liabilities	0	0
Total Liabilities	0	0
Fair Value Inputs Level 1 Member \| Interest Rate Swap Member
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 1 Member \| Credit Default Swap Member
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 1 Member \| Currency Swap Member
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 1 Member \| Equity Securities Other Member
Liabilities Fair Value Disclosure
Other liabilities	0
Fair Value Inputs Level 1 Member \| Forward Contracts Member
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 1 Member \| Nonredeemable Preferred Stock Member
Assets Fair Value Disclosure
Other invested assets	73,446,000	64,268,000
Fair Value Inputs Level 1 Member \| Equity Securities Other Member
Assets Fair Value Disclosure
Other invested assets	136,554,000	147,859,000
Fair Value Inputs Level 1 Member \| Future Member
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 1 Member \| Interest Rate Swap Member
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 1 Member \| Forward Contracts Member
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 1 Member \| Credit Index Product Member
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 1 Member \| Credit Default Swap Member
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 1 Member \| Equity Swap Member
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 1 Member \| Currency Swap Member
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 1 Member \| Securities Pledged As Collateral Member
Assets Fair Value Disclosure
Other invested assets	14,118,000	1,323,000
Fair Value Inputs Level 1 Member \| Other [Member]
Assets Fair Value Disclosure
Other invested assets	7,205,000	11,951,000
Fair Value Inputs Level 1 Member \| Interest Rate Options [Member]
Assets Fair Value Disclosure
Other invested assets	0
Fair Value Inputs Level 1 Member \| Corporate Debt Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	65,890,000	43,544,000
Fair Value Inputs Level 1 Member \| Canadian Provincial Governments [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	0	0
Fair Value Inputs Level 1 Member \| Residential Mortgage Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	0	0
Fair Value Inputs Level 1 Member \| Asset Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	0	0
Fair Value Inputs Level 1 Member \| Commercial Mortgage Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	0	0
Fair Value Inputs Level 1 Member \| US Treasury And Government Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	259,892,000	192,780,000
Fair Value Inputs Level 1 Member \| US States And Political Subdivisions Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	0	0
Fair Value Inputs Level 1 Member \| Other Foreign Government, Supranational And Foreign Government-Sponsored Enterprises
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	272,823,000	297,025,000
Fair Value Inputs Level 2 Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	19,481,405,000	19,520,344,000
Funds withheld at interest embedded derivatives	0	0
Short-term investments	16,659,000	38,177,000
Other invested assets	174,098,000	194,460,000
Cash and cash equivalents	0	0
Total Assets	19,672,162,000	19,752,981,000
Liabilities Fair Value Disclosure
Interest-sensitive contract liabilities - embedded derivatives	0	0
Other liabilities	18,604,000	31,652,000
Total Liabilities	18,604,000	31,652,000
Fair Value Inputs Level 2 Member \| Interest Rate Swap Member
Liabilities Fair Value Disclosure
Other liabilities	1,463,000	196,000
Fair Value Inputs Level 2 Member \| Credit Default Swap Member
Liabilities Fair Value Disclosure
Other liabilities	(120,000)	1,953,000
Fair Value Inputs Level 2 Member \| Currency Swap Member
Liabilities Fair Value Disclosure
Other liabilities	10,687,000	27,398,000
Fair Value Inputs Level 2 Member \| Equity Securities Other Member
Liabilities Fair Value Disclosure
Other liabilities	(440,000)
Fair Value Inputs Level 2 Member \| Forward Contracts Member
Liabilities Fair Value Disclosure
Other liabilities	7,014,000	2,105,000
Fair Value Inputs Level 2 Member \| Nonredeemable Preferred Stock Member
Assets Fair Value Disclosure
Other invested assets	10,665,000	10,573,000
Fair Value Inputs Level 2 Member \| Equity Securities Other Member
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 2 Member \| Future Member
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 2 Member \| Interest Rate Swap Member
Assets Fair Value Disclosure
Other invested assets	83,662,000	104,972,000
Fair Value Inputs Level 2 Member \| Forward Contracts Member
Assets Fair Value Disclosure
Other invested assets	0	1,017,000
Fair Value Inputs Level 2 Member \| Credit Index Product Member
Assets Fair Value Disclosure
Other invested assets	945,000	1,446,000
Fair Value Inputs Level 2 Member \| Credit Default Swap Member
Assets Fair Value Disclosure
Other invested assets	(3,391,000)	(1,741,000)
Fair Value Inputs Level 2 Member \| Equity Swap Member
Assets Fair Value Disclosure
Other invested assets	54,351,000	62,514,000
Fair Value Inputs Level 2 Member \| Currency Swap Member
Assets Fair Value Disclosure
Other invested assets	140,000	0
Fair Value Inputs Level 2 Member \| Securities Pledged As Collateral Member
Assets Fair Value Disclosure
Other invested assets	11,672,000	15,679,000
Fair Value Inputs Level 2 Member \| Other [Member]
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 2 Member \| Interest Rate Options [Member]
Assets Fair Value Disclosure
Other invested assets	16,054,000
Fair Value Inputs Level 2 Member \| Corporate Debt Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	10,728,708,000	10,667,964,000
Fair Value Inputs Level 2 Member \| Canadian Provincial Governments [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	3,942,198,000	4,049,334,000
Fair Value Inputs Level 2 Member \| Residential Mortgage Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	936,053,000	948,133,000
Fair Value Inputs Level 2 Member \| Asset Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	468,313,000	459,164,000
Fair Value Inputs Level 2 Member \| Commercial Mortgage Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,522,850,000	1,531,897,000
Fair Value Inputs Level 2 Member \| US Treasury And Government Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	71,309,000	67,872,000
Fair Value Inputs Level 2 Member \| US States And Political Subdivisions Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	270,458,000	259,286,000
Fair Value Inputs Level 2 Member \| Other Foreign Government, Supranational And Foreign Government-Sponsored Enterprises
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,541,516,000	1,536,694,000
Fair Value Inputs Level 3 Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	2,321,649,000	2,237,921,000
Funds withheld at interest embedded derivatives	(156,189,000)	(243,177,000)
Short-term investments	22,001,000	22,031,000
Other invested assets	0	0
Cash and cash equivalents	0	0
Total Assets	2,187,461,000	2,016,775,000
Liabilities Fair Value Disclosure
Interest-sensitive contract liabilities - embedded derivatives	890,476,000	912,361,000
Other liabilities	0	0
Total Liabilities	890,476,000	912,361,000
Fair Value Inputs Level 3 Member \| Interest Rate Swap Member
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 3 Member \| Credit Default Swap Member
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 3 Member \| Currency Swap Member
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 3 Member \| Equity Securities Other Member
Liabilities Fair Value Disclosure
Other liabilities	0
Fair Value Inputs Level 3 Member \| Forward Contracts Member
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 3 Member \| Nonredeemable Preferred Stock Member
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 3 Member \| Equity Securities Other Member
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 3 Member \| Future Member
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 3 Member \| Interest Rate Swap Member
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 3 Member \| Forward Contracts Member
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 3 Member \| Credit Index Product Member
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 3 Member \| Credit Default Swap Member
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 3 Member \| Equity Swap Member
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 3 Member \| Currency Swap Member
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 3 Member \| Securities Pledged As Collateral Member
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 3 Member \| Other [Member]
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 3 Member \| Interest Rate Options [Member]
Assets Fair Value Disclosure
Other invested assets	0
Fair Value Inputs Level 3 Member \| Corporate Debt Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,646,903,000	1,668,563,000
Fair Value Inputs Level 3 Member \| Canadian Provincial Governments [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	0	0
Fair Value Inputs Level 3 Member \| Residential Mortgage Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	140,717,000	93,931,000
Fair Value Inputs Level 3 Member \| Asset Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	288,231,000	232,391,000
Fair Value Inputs Level 3 Member \| Commercial Mortgage Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	175,294,000	167,006,000
Fair Value Inputs Level 3 Member \| US Treasury And Government Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	0	4,538,000
Fair Value Inputs Level 3 Member \| US States And Political Subdivisions Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	42,639,000	43,212,000
Fair Value Inputs Level 3 Member \| Other Foreign Government, Supranational And Foreign Government-Sponsored Enterprises
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	$ 27,865,000	$ 28,280,000

Repurchase of Collateral Finance Facility Notes (Narrative Details) - USD ($)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Repurchase Of Collateral Finance Facility Notes [Abstract]
Debt Instrument Repurchased Face Amount	$ 160,000,000
Repurchase of long-term debt	112,000,000	$ 0
Gains Losses On Extinguishment Of Collateral Finance Securities	$ 46,506,000	$ 0

Investments (Details 19) - USD ($)	Mar. 31, 2013	Dec. 31, 2012
Other Investments [Line Items]
Other invested assets	$ 1,129,651,000	$ 1,159,543,000
Equity Securities [Member]
Other Investments [Line Items]
Other invested assets	220,665,000	222,700,000
Limited Partner [Member]
Other Investments [Line Items]
Other invested assets	375,451,000	356,419,000
Secured Debt [Member]
Other Investments [Line Items]
Other invested assets	272,592,000	306,497,000
Gain (Loss) on Derivatives [Member]
Other Investments [Line Items]
Other invested assets	151,761,000	168,208,000
Other [Member]
Other Investments [Line Items]
Other invested assets	$ 109,182,000	$ 105,719,000

Fair Value Disclosures (Details 4) - USD ($)	3 Months Ended
Fair Value Disclosures (Details 4) - USD ($)	Mar. 31, 2013	Mar. 31, 2012
Mortgage Loans [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value Assets Carrying Value Prior To Impairment	$ 13,581,000	$ 32,671,000
Fair Value Assets Estimate Of Fair Value	13,700,000	28,875,000
Fair Value Assets Gains Losses	119,000	(3,796,000)
Limited Partnership Interest [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value Assets Carrying Value Prior To Impairment	11,590,000	0
Fair Value Assets Estimate Of Fair Value	9,161,000	0
Fair Value Assets Gains Losses	$ (2,429,000)	$ 0

Derivative Instruments (Tables)

3 Months Ended

Mar. 31, 2013

Derivative Instruments [Abstract]

Schedule Of Derivative Instruments In Statement Of Financial Position Fair Value

				March 31, 2013						December 31, 2012
					Notional	Carrying Value/Fair Value					Notional	Carrying Value/Fair Value
					Amount		Assets		Liabilities		Amount		Assets		Liabilities
Derivatives not designated as
	hedging instruments:
	Interest rate swaps			$	1,566,403	$	99,860	$	15,642	$	2,195,059	$	123,085	$	17,867
	Interest rate options				240,000		16,054		--		--		--		--
	Financial futures				113,046		--		--		127,877		--		--
	Foreign currency forwards				70,000		--		7,014		74,400		1,017		2,105
	Consumer price index swaps				85,332		945		--		85,135		1,446		--
	Credit default swaps				716,700		2,160		5,431		714,000		2,228		5,922
	Equity options				812,494		54,791		--		696,776		62,514		--
	Synthetic guaranteed investment contracts				3,185,035		--		--		2,018,073		--		--
	Embedded derivatives in:
		Modified coinsurance or funds
			withheld arrangements		--		--		156,189		--		--		243,177
		Indexed annuity products			--		--		769,685		--		--		740,256
		Variable annuity products			--		--		120,791		--		--		172,105
	Total non-hedging derivatives				6,789,010		173,810		1,074,752		5,911,320		190,290		1,181,432

Derivatives designated as
	hedging instruments:
	Interest rate swaps				55,098		254		2,273		57,275		344		786
	Foreign currency swaps				632,921		1,172		11,719		629,512		--		27,398
	Total hedging derivatives				688,019		1,426		13,992		686,787		344		28,184
Total derivatives				$	7,477,029	$	175,236	$	1,088,744	$	6,598,107	$	190,634	$	1,209,616

Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block]

	Three months ended March 31,
	2013		2012
Accumulated other comprehensive income (loss), balance beginning of period	$	403	$	(828)
Gains (losses) deferred in other comprehensive income (loss) on the effective portion of cash flow hedges		1,863		323
Amounts reclassified to investment income		(305)		(357)
Accumulated other comprehensive income (loss), balance end of period	$	1,961	$	(862)

Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]

Derivatives in Cash Flow Hedging Relationships	Amount of Gains (Losses) Deferred in AOCI on Derivatives		Amount and Location of Gains (Losses) Reclassified from AOCI into Income (Loss)				Amount and Location of Gains (Losses) Recognized in Income (Loss) on Derivatives
	(Effective Portion)		(Effective Portion)				(Ineffective Portion and Amounts Excluded from Effectiveness Testing)
			Investment Related Gains (Losses)		Investment Income		Investment Related Gains (Losses)		Investment Income
For the three months ended March 31, 2013:
Interest rate swaps	$	1,863	$	--	$	305	$	(17)	$	--

For the three months ended March 31, 2012:
Interest rate swaps	$	323	$	--	$	357	$	(24)	$	--

Derivatives Hedging Instruments In Net Investment Hedging Relationships

		Derivative Gains (Losses) Deferred in AOCI
		For the three months ended March 31,
Type of NIFO Hedge ^{(1) (2)}		2013		2012

Foreign currency swaps		$	10,922	$	(10,645)

(1)	There were no sales or substantial liquidations of net investments in foreign operations that would have required the reclassification of gains or losses from accumulated other comprehensive income (loss) into investment income during the periods presented.
(2)	There was no ineffectiveness recognized for the Company's hedges of net investments in foreign operations.

Derivative Instruments Gain Loss By Income Statement Location

A summary of the effect of non-hedging derivatives, including embedded derivatives, on the Company’s income statement for the three months ended March 31, 2013 and 2012 is as follows (dollars in thousands):

				Gain (Loss) for the Three Months Ended
				March 31,
Type of Non-hedging Derivative		Income Statement Location of Gain (Loss)		2013		2012
Interest rate swaps		Investment related gains (losses), net		$	(22,265)	$	(47,352)
Interest rate options		Investment related gains (losses), net			1,982		--
Financial futures		Investment related gains (losses), net			(6,881)		(17,409)
Foreign currency forwards		Investment related gains (losses), net			(5,659)		(1,608)
CPI swaps		Investment related gains (losses), net			(871)		(802)
Credit default swaps		Investment related gains (losses), net			3,904		11,813
Equity options		Investment related gains (losses), net			(30,623)		(37,983)
Embedded derivatives in:
	Modco or funds withheld arrangements	Investment related gains (losses), net			90,257		(9,428)
	Indexed annuity products	Policy acquisition costs and other insurance
			expenses		--		(998)
	Indexed annuity products	Interest credited			(32,996)		(18,741)
	Variable annuity products	Investment related gains (losses), net			51,314		146,375
Total non-hedging derivatives				$	48,162	$	23,867

Disclosure Of Credit Derivatives [Text Block]

		March 31, 2013						December 31, 2012
Rating Agency Designation of Referenced Credit Obligations⁽¹⁾		Estimated Fair Value of Credit Default Swaps		Maximum Amount of Future Payments under Credit Default Swaps⁽²⁾		Weighted Average Years to Maturity⁽³⁾	Estimated Fair Value of Credit Default Swaps		Maximum Amount of Future Payments under Credit Default Swaps⁽²⁾		Weighted Average Years to Maturity⁽³⁾
AAA/AA-/A+/A/A-
Single name credit default swaps		$	(1,630)	$	124,500	5.7	$	(2,077)	$	124,500	5.9
Credit default swaps referencing indices			--		--	--		--		--	--
	Subtotal		(1,630)		124,500	5.7		(2,077)		124,500	5.9

BBB+/BBB/BBB-
Single name credit default swaps			(2,030)		138,200	5.7		(2,345)		135,500	5.5
Credit default swaps referencing indices			565		430,000	4.7		937		430,000	5.0
	Subtotal		(1,465)		568,200	5.0		(1,408)		565,500	5.1

BB+
Single name credit default swaps			(110)		6,000	4.2		(222)		6,000	4.5
Credit default swaps referencing indices			--		--	--		--		--	--
	Subtotal		(110)		6,000	4.2		(222)		6,000	4.5

Total		$	(3,205)	$	698,700	5.1	$	(3,707)	$	696,000	5.2

(1)	The rating agency designations are based on ratings from Standard and Poor's ("S&P").
(2)	Assumes the value of the referenced credit obligations is zero.
(3)	The weighted average years to maturity of the credit default swaps is calculated based on weighted average notional amounts.

Changes In Estimated Fair Value Related To Embedded Derivatives

		Three months ended
		March 31,
		2013		2012
Embedded derivatives in modco or funds withheld arrangements included
	in investment related gains	$	90,257	$	(9,428)
After the associated amortization of DAC and taxes, the related amounts included in net income			21,624		1,933

Embedded derivatives in variable annuity contracts included in investment related gains			51,314		146,375
After the associated amortization of DAC and taxes, the related amounts included in net income			12,192		15,082
Amounts related to embedded derivatives in equity-indexed annuities included
	in benefits and expenses		(32,996)		(19,739)
After the associated amortization of DAC and taxes, the related amounts included in net income			(29,550)		13,870

Credit Risk

			March 31, 2013		December 31, 2012
Estimated fair value of derivatives in net asset position			$	133,157	$	136,558
	Cash provided as collateral⁽¹⁾			6,250		27,867
	Securities pledged to counterparties as collateral⁽²⁾			14,118		1,565
	Cash pledged from counterparties as collateral⁽³⁾			(126,329)		(136,414)
	Securities pledged from counterparties as collateral⁽⁴⁾			(17,664)		(22,458)
Net credit exposure			$	9,532	$	7,118

Margin account related to exchange-traded futures⁽⁵⁾			$	3,529	$	5,605

(1)		Consists of receivable from counterparty, included in other assets.
(2)		Included in other invested assets, primarily consists of U.S. Treasury securities.
(3)		Included in cash and cash equivalents, with obligation to return cash collateral recorded in other liabilities.
(4)		Consists of U.S. Treasury securities.
(5)		Included in cash and cash equivalents.

- Definition

Tabular disclosure of credit derivatives which includes information by sellers of credit derivatives, about each credit derivative, or each group of similar credit derivatives, including (a) the nature of the credit derivative - its term, how it arose, the events or circumstances that would require the seller to perform under the credit derivative, and the current status of the payment/performance risk of the credit derivative; (b) the maximum potential amount of future payments (undiscounted) the seller could be required to make under the credit derivative; (c) the current fair value of the credit derivative; and (d) the nature of any recourse provisions under the credit derivative, and any assets held either as collateral or by third parties. A credit derivative is a derivative instrument (1) in which one or more of its underlyings are related to the credit risk of a specified entity (or a group of entities) or an index based on the credit risk of a group of entities and (2) that exposes the seller to potential loss from credit-risk-related events specified in the contract. Examples of credit derivatives within the scope of this paragraph include, but are not limited to, credit default swaps, credit spread options, and credit index products; also includes a hybrid instrument that has an embedded credit derivative (for example, but not limited to, a credit-linked note).

+ References + Details

Investments (Details 11) - USD ($)	Mar. 31, 2013	Dec. 31, 2012
Mortgage Loans Property Type Indicators [Line Items]
Loans Receivable Commercial Real Estate	$ 2,335,115,000	$ 2,312,167,000
Apartment [Member]
Mortgage Loans Property Type Indicators [Line Items]
Loans Receivable Commercial Real Estate	$ 230,762,000	$ 229,266,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	9.90%	9.90%
Retail [Member]
Mortgage Loans Property Type Indicators [Line Items]
Loans Receivable Commercial Real Estate	$ 715,036,000	$ 669,958,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	30.60%	29.00%
Office Building [Member]
Mortgage Loans Property Type Indicators [Line Items]
Loans Receivable Commercial Real Estate	$ 836,332,000	$ 825,406,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	35.80%	35.70%
Industrial [Member]
Mortgage Loans Property Type Indicators [Line Items]
Loans Receivable Commercial Real Estate	$ 426,011,000	$ 455,682,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	18.20%	19.70%
Other Commercial [Member]
Mortgage Loans Property Type Indicators [Line Items]
Loans Receivable Commercial Real Estate	$ 126,974,000	$ 131,855,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	5.50%	5.70%

- Definition

+ References

+ Details

Fair Value Disclosures (Details 1) - USD ($)	Mar. 31, 2013	Dec. 31, 2012
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities	$ 769,685,000
Interest-sensitive contract liabilities - embedded derivatives - variable annuities	$ 120,791,000
Discounted Cash Flow [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities		$ 740,256,000
Interest-sensitive contract liabilities - embedded derivatives - variable annuities		$ 172,105,000
Discounted Cash Flow [Member] \| Mortality [Member] \| Minimum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range	0.00%	0.00%
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	0.00%	0.00%
Discounted Cash Flow [Member] \| Mortality [Member] \| Maximum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range	100.00%	100.00%
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	100.00%	100.00%
Discounted Cash Flow [Member] \| Mortality [Member] \| Weighted Average [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range	1.00%	1.00%
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	2.00%	2.00%
Discounted Cash Flow [Member] \| Lapse [Member] \| Minimum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range	0.00%	0.00%
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	0.00%	0.00%
Discounted Cash Flow [Member] \| Lapse [Member] \| Maximum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range	35.00%	35.00%
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	25.00%	25.00%
Discounted Cash Flow [Member] \| Lapse [Member] \| Weighted Average [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range	6.00%	6.00%
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	5.00%	5.00%
Discounted Cash Flow [Member] \| Withdrawal [Member] \| Minimum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range	0.00%	0.00%
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	0.00%	0.00%
Discounted Cash Flow [Member] \| Withdrawal [Member] \| Maximum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range	5.00%	5.00%
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	7.00%	7.00%
Discounted Cash Flow [Member] \| Withdrawal [Member] \| Weighted Average [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range	3.00%	3.00%
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	3.00%	3.00%
Discounted Cash Flow [Member] \| Own Credit [Member] \| Minimum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	0.00%	0.00%
Discounted Cash Flow [Member] \| Own Credit [Member] \| Maximum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	1.00%	1.00%
Discounted Cash Flow [Member] \| Own Credit [Member] \| Weighted Average [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	1.00%	1.00%
Discounted Cash Flow [Member] \| Option Budget Projection [Member] \| Minimum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range	2.00%	2.00%
Discounted Cash Flow [Member] \| Option Budget Projection [Member] \| Maximum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range	4.00%	4.00%
Discounted Cash Flow [Member] \| Option Budget Projection [Member] \| Weighted Average [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range	3.00%	3.00%
Discounted Cash Flow [Member] \| Long Term Volatility [Member] \| Minimum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	0.00%	0.00%
Discounted Cash Flow [Member] \| Long Term Volatility [Member] \| Maximum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	27.00%	27.00%
Discounted Cash Flow [Member] \| Long Term Volatility [Member] \| Weighted Average [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	13.00%	14.00%
Total Return Swap [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Funds withheld at interest - embedded derivatives	$ (156,189,000)	$ (243,177,000)
Total Return Swap [Member] \| Mortality [Member] \| Minimum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Funds withheld at interest - embedded derivatives Unobservable Input Range	0.00%	0.00%
Total Return Swap [Member] \| Mortality [Member] \| Maximum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Funds withheld at interest - embedded derivatives Unobservable Input Range	100.00%	100.00%
Total Return Swap [Member] \| Mortality [Member] \| Weighted Average [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Funds withheld at interest - embedded derivatives Unobservable Input Range	1.00%	1.00%
Total Return Swap [Member] \| Lapse [Member] \| Minimum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Funds withheld at interest - embedded derivatives Unobservable Input Range	0.00%	0.00%
Total Return Swap [Member] \| Lapse [Member] \| Maximum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Funds withheld at interest - embedded derivatives Unobservable Input Range	35.00%	35.00%
Total Return Swap [Member] \| Lapse [Member] \| Weighted Average [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Funds withheld at interest - embedded derivatives Unobservable Input Range	4.00%	6.00%
Total Return Swap [Member] \| Withdrawal [Member] \| Minimum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Funds withheld at interest - embedded derivatives Unobservable Input Range	0.00%	0.00%
Total Return Swap [Member] \| Withdrawal [Member] \| Maximum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Funds withheld at interest - embedded derivatives Unobservable Input Range	5.00%	5.00%
Total Return Swap [Member] \| Withdrawal [Member] \| Weighted Average [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Funds withheld at interest - embedded derivatives Unobservable Input Range	4.00%	3.00%
Total Return Swap [Member] \| Own Credit [Member] \| Minimum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Funds withheld at interest - embedded derivatives Unobservable Input Range	0.00%	0.00%
Total Return Swap [Member] \| Own Credit [Member] \| Maximum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Funds withheld at interest - embedded derivatives Unobservable Input Range	1.00%	1.00%
Total Return Swap [Member] \| Own Credit [Member] \| Weighted Average [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Funds withheld at interest - embedded derivatives Unobservable Input Range	1.00%	1.00%
Total Return Swap [Member] \| Crediting Rate [Member] \| Minimum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Funds withheld at interest - embedded derivatives Unobservable Input Range	2.00%	2.00%
Total Return Swap [Member] \| Crediting Rate [Member] \| Maximum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Funds withheld at interest - embedded derivatives Unobservable Input Range	4.00%	4.00%
Total Return Swap [Member] \| Crediting Rate [Member] \| Weighted Average [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
Funds withheld at interest - embedded derivatives Unobservable Input Range	3.00%	3.00%
Market Comparable Securities [Member] \| Liquidity Premium [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
State And Political Subdivision Securities	$ 5,364,000	$ 5,451,000
Corporate Securities	429,817,000	450,177,000
Short-term Investments	$ 22,001,000	$ 22,031,000
Market Comparable Securities [Member] \| Liquidity Premium [Member] \| Minimum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
State And Political Subdivision Securities Unobservable Input Range	1.00%	1.00%
Corporate Securities Unobservable Input Range	0.00%	0.00%
Short Term Investments Unobservable Input Range	1.00%	1.00%
Market Comparable Securities [Member] \| Liquidity Premium [Member] \| Maximum [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
State And Political Subdivision Securities Unobservable Input Range	1.00%	1.00%
Corporate Securities Unobservable Input Range	2.00%	2.00%
Short Term Investments Unobservable Input Range	1.00%	1.00%
Market Comparable Securities [Member] \| Liquidity Premium [Member] \| Weighted Average [Member]
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]
State And Political Subdivision Securities Unobservable Input Range	1.00%	1.00%
Corporate Securities Unobservable Input Range	1.00%	1.00%
Short Term Investments Unobservable Input Range	1.00%	1.00%

Investments (Tables)

3 Months Ended

Mar. 31, 2013

Investments Abstract

Available For Sale Securities

													Other-than-
									Estimated				temporary
March 31, 2013:			Amortized		Unrealized		Unrealized		Fair		% of		impairments
			Cost		Gains		Losses		Value		Total		in AOCI
Available-for-sale:
	Corporate securities		$	11,464,082	$	1,022,512	$	45,093	$	12,441,501	55.5	%	$	--
	Canadian and Canadian provincial
		governments		2,681,603		1,261,728		1,133		3,942,198	17.6			--
	Residential mortgage-backed securities			1,005,232		75,579		4,041		1,076,770	4.8			(241)
	Asset-backed securities			752,280		23,333		19,069		756,544	3.4			(2,259)
	Commercial mortgage-backed securities			1,596,659		143,381		41,896		1,698,144	7.6			(5,431)
	U.S. government and agencies			299,395		31,938		132		331,201	1.5			--
	State and political subdivisions			281,215		37,628		5,746		313,097	1.4			--
	Other foreign government, supranational and
		foreign government-sponsored enterprises		1,758,483		87,306		3,585		1,842,204	8.2			--
		Total fixed maturity securities	$	19,838,949	$	2,683,405	$	120,695	$	22,401,659	100.0	%	$	(7,931)

Non-redeemable preferred stock			$	76,179	$	7,940	$	8	$	84,111	38.1	%
Other equity securities				138,088		295		1,829		136,554	61.9
		Total equity securities	$	214,267	$	8,235	$	1,837	$	220,665	100.0	%

													Other-than-
									Estimated				temporary
December 31, 2012:			Amortized		Unrealized		Unrealized		Fair		% of		impairments
			Cost		Gains		Losses		Value		Total		in AOCI
Available-for-sale:
	Corporate securities		$	11,333,431	$	1,085,973	$	39,333	$	12,380,071	55.5	%	$	--
	Canadian and Canadian provincial
		governments		2,676,777		1,372,731		174		4,049,334	18.2			--
	Residential mortgage-backed securities			969,267		76,520		3,723		1,042,064	4.7			(241)
	Asset-backed securities			700,455		19,898		28,798		691,555	3.1			(2,259)
	Commercial mortgage-backed securities			1,608,376		142,369		51,842		1,698,903	7.6			(6,125)
	U.S. government and agencies			231,256		33,958		24		265,190	1.2			--
	State and political subdivisions			270,086		38,058		5,646		302,498	1.4			--
	Other foreign government, supranational and
		foreign government-sponsored enterprises		1,769,784		94,929		2,714		1,861,999	8.3			--
		Total fixed maturity securities	$	19,559,432	$	2,864,436	$	132,254	$	22,291,614	100.0	%	$	(8,625)

Non-redeemable preferred stock			$	68,469	$	6,542	$	170	$	74,841	33.6	%
Other equity securities				148,577		416		1,134		147,859	66.4
		Total equity securities	$	217,046	$	6,958	$	1,304	$	222,700	100.0	%

Investments Classified By Contractual Maturity Date

			Amortized		Fair
			Cost		Value
Available-for-sale:
	Due in one year or less		$	348,130	$	352,916
	Due after one year through five years			3,716,625		3,917,468
	Due after five years through ten years			6,922,683		7,521,433
	Due after ten years			5,497,340		7,078,384
	Asset and mortgage-backed securities			3,354,171		3,531,458
		Total	$	19,838,949	$	22,401,659

Fixed Maturity Holdings Industry Types Weighted Average Credit Ratings [Table Text Block]

March 31, 2013:					Estimated
			Amortized Cost		Fair Value	% of Total
Finance		$	3,693,500	$	3,978,979	32.0	%
Industrial			5,977,146		6,480,028	52.1
Utility			1,763,573		1,951,839	15.7
Other			29,863		30,655	0.2
	Total	$	11,464,082	$	12,441,501	100.0	%

December 31, 2012:					Estimated
			Amortized Cost		Fair Value	% of Total
Finance		$	3,619,455	$	3,900,152	31.5	%
Industrial			5,881,967		6,443,846	52.0
Utility			1,799,658		2,002,611	16.2
Other			32,351		33,462	0.3
	Total	$	11,333,431	$	12,380,071	100.0	%

RollForward Of Cumulative Credit Loss Component Of OTTI Income Loss

	Three months ended March 31,
	2013		2012
Balance, beginning of period	$	16,675	$	63,947
Initial impairments - credit loss OTTI recognized on securities not previously impaired		--		1,902
Additional impairments - credit loss OTTI recognized on securities previously impaired		--		8,720
Credit loss OTTI previously recognized on securities impaired to fair value during the period		--		(11,381)
Credit loss OTTI previously recognized on securities which matured, paid down, prepaid or were sold during the period		(1,902)		(952)
Balance, end of period	$	14,773	$	62,236

Accounting for Certain Loans and Debt Securities Acquired in Transfer Disclosure [Text Block]

		March 31, 2013		December 31, 2012
Outstanding principal and interest balance⁽¹⁾		$	172,800	$	108,831
Carrying value, including accrued interest⁽²⁾		$	134,564	$	84,765

(1)	Represents the contractually required payments which is the sum of contractual principal, whether or not currently due, and accrued interest.
(2)	Estimated fair value plus accrued interest.

Schedule Of Certain Loans Acquired In Transfer Accounted For As Available For Sale Debt Securities At Acquisition Date [Table Text Block]

		At Date of
		Acquisition
Contractually required payments (including interest)		$	91,863
Cash flows expected to be collected⁽¹⁾		$	72,940
Fair value of investments acquired		$	50,874

(1)	Represents undiscounted principal and interest cash flow expectations at the date of acquisition.

Schedule Of Certain Loans Acquired In Transfer Accounted For As Available For Sale Debt Securities Accretable Yield [Table Text Block]

	Three months ended
	March 31, 2013
Balance, beginning of period	$	39,239
Investments purchased		22,066
Accretion		(1,943)
Reclassification to nonaccretable difference		553
Balance, end of period	$	59,915

Investments In Debt And Equity Securities Gross Unrealized Losses Disclosures

		March 31, 2013				December 31, 2012
		Gross				Gross
		Unrealized				Unrealized
		Losses		% of Total		Losses		% of Total
Less than 20%		$	66,235	54.1	%	$	54,951	41.2	%
20% or more for less than six months			--	--			734	0.5
20% or more for six months or greater			56,297	45.9			77,873	58.3
	Total	$	122,532	100.0	%	$	133,558	100.0	%

Fair Value And Investments In Debt And Marketable Equity Securities And Certain Trading Assets Disclosures

			Less than 12 months				12 months or greater				Total
					Gross				Gross				Gross
March 31, 2013:			Estimated		Unrealized		Estimated		Unrealized		Estimated		Unrealized
			Fair Value		Losses		Fair Value		Losses		Fair Value		Losses
Investment grade securities:
	Corporate securities		$	1,187,238	$	25,066	$	89,284	$	11,614	$	1,276,522	$	36,680
	Canadian and Canadian provincial
		governments		59,042		1,133		--		--		59,042		1,133
	Residential mortgage-backed securities			54,738		469		17,664		2,920		72,402		3,389
	Asset-backed securities			91,530		672		86,661		7,216		178,191		7,888
	Commercial mortgage-backed securities			79,509		471		21,920		6,521		101,429		6,992
	U.S. government and agencies			56,975		132		--		--		56,975		132
	State and political subdivisions			30,734		266		11,463		5,480		42,197		5,746
	Other foreign government, supranational and
		foreign government-sponsored enterprises		335,216		2,809		7,375		744		342,591		3,553
		Total investment grade securities		1,894,982		31,018		234,367		34,495		2,129,349		65,513

Non-investment grade securities:
	Corporate securities			155,261		2,961		30,763		5,452		186,024		8,413
	Residential mortgage-backed securities			18,215		298		4,681		354		22,896		652
	Asset-backed securities			10,138		171		29,370		11,010		39,508		11,181
	Commercial mortgage-backed securities			--		--		66,674		34,904		66,674		34,904
	Other foreign government, supranational and
		foreign government-sponsored enterprises		1,034		32		--		--		1,034		32
		Total non-investment grade securities		184,648		3,462		131,488		51,720		316,136		55,182
		Total fixed maturity securities	$	2,079,630	$	34,480	$	365,855	$	86,215	$	2,445,485	$	120,695

	Non-redeemable preferred stock		$	7,885	$	7	$	1	$	1	$	7,886	$	8
	Other equity securities			110,187		1,829		--		--		110,187		1,829
		Total equity securities	$	118,072	$	1,836	$	1	$	1	$	118,073	$	1,837

			Less than 12 months				12 months or greater				Total
					Gross				Gross				Gross
December 31, 2012:			Estimated		Unrealized		Estimated		Unrealized		Estimated		Unrealized
			Fair Value		Losses		Fair Value		Losses		Fair Value		Losses
Investment grade securities:
	Corporate securities		$	786,203	$	13,276	$	108,187	$	17,386	$	894,390	$	30,662
	Canadian and Canadian provincial
		governments		12,349		174		--		--		12,349		174
	Residential mortgage-backed securities			22,288		97		19,394		3,199		41,682		3,296
	Asset-backed securities			59,119		449		96,179		9,508		155,298		9,957
	Commercial mortgage-backed securities			89,507		797		29,181		7,974		118,688		8,771
	U.S. government and agencies			7,272		24		--		--		7,272		24
	State and political subdivisions			20,602		1,514		11,736		4,132		32,338		5,646
	Other foreign government, supranational and
		foreign government-sponsored enterprises		244,817		1,953		7,435		761		252,252		2,714
		Total investment grade securities		1,242,157		18,284		272,112		42,960		1,514,269		61,244

Non-investment grade securities:
	Corporate securities			181,168		3,170		39,123		5,501		220,291		8,671
	Residential mortgage-backed securities			15,199		80		2,633		347		17,832		427
	Asset-backed securities			3,421		26		31,938		18,815		35,359		18,841
	Commercial mortgage-backed securities			3,317		764		68,405		42,307		71,722		43,071
		Total non-investment grade securities		203,105		4,040		142,099		66,970		345,204		71,010
		Total fixed maturity securities	$	1,445,262	$	22,324	$	414,211	$	109,930	$	1,859,473	$	132,254

	Non-redeemable preferred stock		$	5,577	$	52	$	5,679	$	118	$	11,256	$	170
	Other equity securities			85,374		1,134		--		--		85,374		1,134
		Total equity securities	$	90,951	$	1,186	$	5,679	$	118	$	96,630	$	1,304

Investment Income

Investment Income, Net of Related Expenses

Major categories of investment income, net of related expenses, consist of the following (dollars in thousands):

	Three months ended
	March 31,
	2013		2012
Fixed maturity securities available-for-sale	$	239,244	$	191,418
Mortgage loans on real estate		28,243		14,965
Policy loans		17,910		16,783
Funds withheld at interest		137,259		115,014
Short-term investments		813		988
Other invested assets		13,922		11,322
Investment revenue		437,391		350,490
Investment expense		12,260		9,550
Investment income, net of related expenses	$	425,131	$	340,940

Gain Loss On Investments

Investment Related Gains (Losses), Net

Investment related gains (losses), net consist of the following (dollars in thousands):

		Three months ended
		March 31,
		2013		2012
Fixed maturities and equity securities available for sale:
	Other-than-temporary impairment losses on fixed maturities	$	(202)	$	(7,607)
	Portion of loss recognized in accumulated other comprehensive income (before taxes)		--		(7,221)
	Net other-than-temporary impairment losses on fixed maturities recognized in earnings		(202)		(14,828)
	Impairment losses on equity securities		--		(839)
	Gain on investment activity		21,680		22,312
	Loss on investment activity		(11,212)		(7,504)
Other impairment losses and change in mortgage loan provision			(1,626)		(5,843)
Derivatives and other, net			85,731		50,222
Total investment related gains (losses), net		$	94,371	$	43,520

Disclosure Of Real Estate Holdings By Property Type [Table Text Block]

		March 31, 2013				December 31, 2012
		Recorded		Percentage		Recorded		Percentage
Property type:		Investment		of Total		Investment		of Total
	Apartment	$	230,762	9.9	%	$	229,266	9.9	%
	Retail		715,036	30.6			669,958	29.0
	Office building		836,332	35.8			825,406	35.7
	Industrial		426,011	18.2			455,682	19.7
	Other commercial		126,974	5.5			131,855	5.7
Total		$	2,335,115	100.0	%	$	2,312,167	100.0	%

Disclosure Of Real Estate Holdings By Geographical Region [Table Text Block]

		March 31, 2013				December 31, 2012
		Recorded		Percentage		Recorded		Percentage
		Investment		of Total		Investment		of Total
Pacific		$	597,540	25.6	%	$	593,589	25.7	%
South Atlantic			483,398	20.7			477,068	20.5
Mountain			251,406	10.8			233,174	10.1
Middle Atlantic			286,314	12.3			300,475	13.0
West North Central			160,203	6.8			168,063	7.3
East North Central			243,202	10.4			224,122	9.7
West South Central			160,117	6.9			161,451	7.0
East South Central			62,323	2.7			62,789	2.7
New England			90,612	3.8			91,436	4.0
	Total	$	2,335,115	100.0	%	$	2,312,167	100.0	%

Mortgage Loans Classified By Contractual Maturity Date [Table Text Block]

The maturities of the mortgage loans, gross of valuation allowances, as of March 31, 2013 and December 31, 2012 are as follows (dollars in thousands):


		March 31, 2013		December 31, 2012
Due within five years		$	1,157,373	$	1,187,387
Due after five years through ten years			832,292		776,655
Due after ten years			345,450		348,125
	Total	$	2,335,115	$	2,312,167

Mortgage Loan Internal Credit Risk Grade [Table Text Block]

Internal credit risk grade:			March 31, 2013		December 31, 2012
	High investment grade		$	1,473,018	$	1,235,605
	Investment grade			622,794		834,494
	Average			147,650		132,607
	Watch list			62,679		76,463
	In or near default			28,974		32,998
		Total	$	2,335,115	$	2,312,167

Schedule Of Analysis Of Past Due Financing Receivables

			March 31, 2013		December 31, 2012
31-60 days past due			$	6,594	$	7,504
61-90 days past due				--		--
Greater than 90 days				8,342		16,886
	Total past due			14,936		24,390
Current				2,320,179		2,287,777
		Total	$	2,335,115	$	2,312,167

Recorded Investment And Allowance For Credit Losses

The following table presents the recorded investment in mortgage loans, by method of evaluation of credit loss, and the related valuation allowances, by type of credit loss, at (dollars in thousands):

			March 31, 2013		December 31, 2012
Mortgage loans:
	Evaluated individually for credit losses		$	41,167	$	39,956
	Evaluated collectively for credit losses			2,293,948		2,272,211
		Mortgage loans, gross of valuation allowances		2,335,115		2,312,167

Valuation allowances:
	Specific for credit losses			6,008		6,980
	Non-specifically identified credit losses			3,916		4,600
		Total valuation allowances		9,924		11,580

		Mortgage loans, net of valuation allowances	$	2,325,191	$	2,300,587

Allowance For Mortgage Loan And Lease Losses Provision For Loss Net

	Three Months Ended March 31,
	2013		2012
Balance, beginning of period	$	11,580	$	11,793
Charge-offs		(852)		(2,193)
Provision (release)		(804)		5,050
Balance, end of period	$	9,924	$	14,650

Impaired Financing Receivables Table

		Unpaid Principal Balance		Recorded Investment		Related Allowance		Carrying Value
March 31, 2013:
Impaired mortgage loans with no valuation allowance recorded		$	14,802	$	14,259	$	--	$	14,259
Impaired mortgage loans with valuation allowance recorded			26,975		26,908		6,008		20,900
	Total impaired mortgage loans	$	41,777	$	41,167	$	6,008	$	35,159

December 31, 2012:
Impaired mortgage loans with no valuation allowance recorded		$	13,039	$	12,496	$	--	$	12,496
Impaired mortgage loans with valuation allowance recorded			27,527		27,460		6,980		20,480
	Total impaired mortgage loans	$	40,566	$	39,956	$	6,980	$	32,976

		Three Months Ended
		March 31, 2013				March 31, 2012
		Average Investment⁽¹⁾		Interest Income		Average Investment⁽¹⁾		Interest Income
Impaired mortgage loans with no valuation allowance recorded		$	13,378	$	135	$	21,571	$	169
Impaired mortgage loans with valuation allowance recorded			27,184		240		37,308		308
	Total	$	40,562	$	375	$	58,879	$	477

(1)	Average recorded investment represents the average loan balances as of the beginning of period and all subsequent quarterly end of period balances.

Schedule Of Other Invested Assets [Table Text Block]

		March 31, 2013		December 31, 2012
Equity securities		$	220,665	$	222,700
Limited partnerships and real estate joint ventures			375,451		356,419
Structured loans			272,592		306,497
Derivatives			151,761		168,208
Other			109,182		105,719
	Total other invested assets	$	1,129,651	$	1,159,543

Offsetting Assets And Liabilities [Table Text Block]

								Gross Amounts Not Offset in the Balance Sheet
				Gross Amounts		Net Amounts				Cash Collateral
		Gross Amounts		Offset in the		Presented in the		Financial		Pledged/
		Recognized		Balance Sheet		Balance Sheet		Instruments		Received		Net Amount
March 31, 2013:
	Derivative assets	$	175,236	$	(23,475)	$	151,761	$	(17,664)	$	(126,329)	$	7,768
	Derivative liabilities		42,079		(23,475)		18,604		(14,118)		(6,250)		(1,764)

December 31, 2012:
	Derivative assets	$	190,634	$	(22,426)	$	168,208	$	(22,458)	$	(136,414)	$	9,336
	Derivative liabilities		54,078		(22,426)		31,652		(1,565)		(27,867)		2,220

Investments (Details 16) - USD ($)	Mar. 31, 2013	Dec. 31, 2012
Mortgage Loans:
Total mortgage loans	$ 2,335,115,000	$ 2,312,167,000
Mortgage Loans Net Of Valuation Allowances [Abstract]
Mortgage loans on real estate	2,325,191,000	2,300,587,000
Commercial Real Estate Portfolio Segment Member
Mortgage Loans:
Evaluated individually for credit losses	41,167,000	39,956,000
Evaluated collectively for credit losses	2,293,948,000	2,272,211,000
Total mortgage loans	2,335,115,000	2,312,167,000
Valuation Allowances:
Specific for credit losses	6,008,000	6,980,000
Non-specifically identified credit losses	3,916,000	4,600,000
Total valuation allowances	$ 9,924,000	$ 11,580,000

Investments (Narrative Details)	3 Months Ended		12 Months Ended
Investments (Narrative Details)	Mar. 31, 2013 USD ($)	Mar. 31, 2012 USD ($)	Dec. 31, 2012 USD ($)
Investment Narrative [Line Items]
Proceeds From Sale Of Available For Sale Securities Sold At Loss	$ 204,300,000	$ 248,100,000
Available For Sale Securities Amortized Cost	11,464,082,000		$ 11,333,431,000
Available For Sale Securities Fair Value Disclosure	$ 12,441,501,000		$ 12,380,071,000
Mortgage Loan Percent Of Cash And Invested Assets	7.00%		7.00%
Impaired Financing Receivable Interest Income Accrual Method	$ 570,000	$ 234,000
Available For Sale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions	667		567
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	$ 46,300,000		$ 61,500,000
Other Invested Assets As A Percentage Of Total Investments	3.40%		3.50%
Policy Loans Percent Of Total Investments	3.80%		3.90%
Funds Withheld At Interest Percent Of Total Investments	17.30%		17.00%
SecuritiesSoldUnderAgreementsToRepurchase	$ 343,200,000		$ 342,000,000
Funds Held Under Reinsurance Agreements Asset Specific Client	70.20%		69.70%
Available For Sale Securities Amortized Cost [Member]
Investment Narrative [Line Items]
SecuritiesSoldUnderAgreementsToRepurchase	$ 284,500,000		$ 290,200,000
Assets Held In Trust	8,216,300,000		7,549,000,000
Available For Sale Securities Fair Value Disclosure [Member]
Investment Narrative [Line Items]
SecuritiesSoldUnderAgreementsToRepurchase	309,700,000		305,900,000
Assets Held In Trust	8,889,900,000		7,913,800,000
Borrowed Securities [Member]
Investment Narrative [Line Items]
Available For Sale Securities Amortized Cost	87,500,000		87,500,000
Available For Sale Securities Fair Value Disclosure	87,500,000		87,500,000
Collateral Fixed Maturity Securities [Member]
Investment Narrative [Line Items]
Proceeds From Sale Of Available For Sale Securities Sold At Loss	85,400,000		95,600,000
Available For Sale Securities Amortized Cost	25,400,000		16,900,000
Available For Sale Securities Fair Value Disclosure	25,800,000		17,000,000
Canadian Province Of Ontario Securities [Member]
Investment Narrative [Line Items]
Available For Sale Securities Fair Value Disclosure	1,357,900,000		1,400,000,000
Canadian Province Of Quebec Securities [Member]
Investment Narrative [Line Items]
Available For Sale Securities Fair Value Disclosure	$ 1,723,900,000		$ 1,785,000,000

Derivative Instruments (Details) - USD ($)	Mar. 31, 2013	Dec. 31, 2012
Derivative Instruments [Line Items]
Notional Amount	$ 7,477,029,000	$ 6,598,107,000
Carrying Value / Fair Value of Assets	175,236,000	190,634,000
Carrying Value / Fair Value of Liabilities	1,088,744,000	1,209,616,000
Designated As Hedging [Member]
Derivative Instruments [Line Items]
Notional Amount	688,019,000	686,787,000
Carrying Value / Fair Value of Assets	1,426,000	344,000
Carrying Value / Fair Value of Liabilities	13,992,000	28,184,000
Designated As Hedging [Member] \| Interest Rate Swap Member
Derivative Instruments [Line Items]
Notional Amount	55,098,000	57,275,000
Carrying Value / Fair Value of Assets	254,000	344,000
Carrying Value / Fair Value of Liabilities	2,273,000	786,000
Designated As Hedging [Member] \| Foreign Exchange Forward Member
Derivative Instruments [Line Items]
Notional Amount	632,921,000	629,512,000
Carrying Value / Fair Value of Assets	1,172,000	0
Carrying Value / Fair Value of Liabilities	11,719,000	27,398,000
Designated As Non Hedging [Member]
Derivative Instruments [Line Items]
Notional Amount	6,789,010,000	5,911,320,000
Carrying Value / Fair Value of Assets	173,810,000	190,290,000
Carrying Value / Fair Value of Liabilities	1,074,752,000	1,181,432,000
Designated As Non Hedging [Member] \| Interest Rate Swap Member
Derivative Instruments [Line Items]
Notional Amount	1,566,403,000	2,195,059,000
Carrying Value / Fair Value of Assets	99,860,000	123,085,000
Carrying Value / Fair Value of Liabilities	15,642,000	17,867,000
Designated As Non Hedging [Member] \| Future Member
Derivative Instruments [Line Items]
Notional Amount	113,046,000	127,877,000
Carrying Value / Fair Value of Assets	0	0
Carrying Value / Fair Value of Liabilities	0	0
Designated As Non Hedging [Member] \| Foreign Exchange Forward Member
Derivative Instruments [Line Items]
Notional Amount	70,000,000	74,400,000
Carrying Value / Fair Value of Assets	0	1,017,000
Carrying Value / Fair Value of Liabilities	7,014,000	2,105,000
Designated As Non Hedging [Member] \| Consumer Price Index Swap [Member]
Derivative Instruments [Line Items]
Notional Amount	85,332,000	85,135,000
Carrying Value / Fair Value of Assets	945,000	1,446,000
Carrying Value / Fair Value of Liabilities	0	0
Designated As Non Hedging [Member] \| Credit Default Swap Member
Derivative Instruments [Line Items]
Notional Amount	716,700,000	714,000,000
Carrying Value / Fair Value of Assets	2,160,000	2,228,000
Carrying Value / Fair Value of Liabilities	5,431,000	5,922,000
Designated As Non Hedging [Member] \| Equity Member
Derivative Instruments [Line Items]
Notional Amount	812,494,000	696,776,000
Carrying Value / Fair Value of Assets	54,791,000	62,514,000
Carrying Value / Fair Value of Liabilities	0	0
Designated As Non Hedging [Member] \| Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements [Member]
Derivative Instruments [Line Items]
Notional Amount	0	0
Carrying Value / Fair Value of Assets	0	0
Carrying Value / Fair Value of Liabilities	156,189,000	243,177,000
Designated As Non Hedging [Member] \| Embedded Derivatives In Indexed Annuity [Member]
Derivative Instruments [Line Items]
Notional Amount	0	0
Carrying Value / Fair Value of Assets	0	0
Carrying Value / Fair Value of Liabilities	769,685,000	740,256,000
Designated As Non Hedging [Member] \| Embedded Derivatives In Variable Annuity [Member]
Derivative Instruments [Line Items]
Notional Amount	0	0
Carrying Value / Fair Value of Assets	0	0
Carrying Value / Fair Value of Liabilities	120,791,000	172,105,000
Designated As Non Hedging [Member] \| Synthetic Guaranteed Investment Contracts [Member]
Derivative Instruments [Line Items]
Notional Amount	3,185,035,000	2,018,073,000
Carrying Value / Fair Value of Assets	0	0
Carrying Value / Fair Value of Liabilities	0	0
Designated As Non Hedging [Member] \| Interest Rate Options [Member]
Derivative Instruments [Line Items]
Notional Amount	240,000,000	0
Carrying Value / Fair Value of Assets	16,054,000	0
Carrying Value / Fair Value of Liabilities	$ 0	$ 0

Investments (Details 13) - USD ($)	Mar. 31, 2013	Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items]
Loans Receivable Commercial Real Estate	$ 2,335,115,000	$ 2,312,167,000
Mortgage Loans On Real Estate Due One Year Through Five Years [Member]
Mortgage Loans on Real Estate [Line Items]
Loans Receivable Commercial Real Estate	1,157,373,000	1,187,387,000
Mortgage Loans On Real Estate Due After Five Years [Member]
Mortgage Loans on Real Estate [Line Items]
Loans Receivable Commercial Real Estate	832,292,000	776,655,000
Mortgage Loans On Real Estate Due After Ten Years [Member]
Mortgage Loans on Real Estate [Line Items]
Loans Receivable Commercial Real Estate	$ 345,450,000	$ 348,125,000

- Definition

+ References

+ Details

Derivative Instruments (Details 6) - USD ($)	3 Months Ended
Derivative Instruments (Details 6) - USD ($)	Mar. 31, 2013	Mar. 31, 2012
Changes In Estimated Fair Value Related To Embedded Derivatives [Line Items]
Total investment related gains (losses), net	$ 94,371,000	$ 43,520,000
Total benefits and expenses	2,322,275,000	2,112,212,000
Net income	185,535,000	123,318,000
Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements [Member]
Changes In Estimated Fair Value Related To Embedded Derivatives [Line Items]
Total investment related gains (losses), net	90,257,000	(9,428,000)
Net income	21,624,000	1,933,000
Embedded Derivatives In Equity Indexed Annuities [Member]
Changes In Estimated Fair Value Related To Embedded Derivatives [Line Items]
Total benefits and expenses	(32,996,000)	(19,739,000)
Net income	(29,550,000)	13,870,000
Embedded Derivatives In Variable Annuity Contracts [Member]
Changes In Estimated Fair Value Related To Embedded Derivatives [Line Items]
Total investment related gains (losses), net	51,314,000	146,375,000
Net income	$ 12,192,000	$ 15,082,000

- Definition

This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 13, 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 5
-Section 03
-Paragraph 7

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7(c),9(a))
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (c)-(e)
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27405-111563

+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

Segment Information (Details) - USD ($)	3 Months Ended
Segment Information (Details) - USD ($)	Mar. 31, 2013	Mar. 31, 2012
Segment Total Revenue [Line Items]
Total revenues	$ 2,601,102,000	$ 2,292,975,000
US Segment Reporting Information [Member]
Segment Total Revenue [Line Items]
Total revenues	1,500,264,000	1,324,147,000
Canada Segment Reporting Information [Member]
Segment Total Revenue [Line Items]
Total revenues	297,089,000	275,623,000
Europe And South Africa Segment Reporting Information [Member]
Segment Total Revenue [Line Items]
Total revenues	339,229,000	308,337,000
Asia Pacific Segment Reporting Information [Member]
Segment Total Revenue [Line Items]
Total revenues	388,969,000	359,685,000
Corporate And Other Segment Reporting Information [Member]
Segment Total Revenue [Line Items]
Total revenues	$ 75,551,000	$ 25,183,000

Repurchase of Collateral Finance Facility Notes

3 Months Ended

Mar. 31, 2013

Repurchase Of Collateral Finance Facility Notes [Abstract]

Collateral Financing Arrangements [Text Block]

12. Repurchase of Collateral Finance Facility Notes

On January 17, 2013, the Company repurchased $160.0 million face amount of its Series A Floating Rate Insured Notes issued by RGA's subsidiary, Timberlake Financial, L.L.C., for $112.0 million, which was the market value at the date of the purchase. The notes were purchased by RGA Reinsurance Company, also a subsidiary of RGA. As a result, the Company recorded a pre-tax gain of $46.5 million, after fees, in other revenues.

Financing Activities (Narrative Details) - USD ($)	1 Months Ended			3 Months Ended
Financing Activities (Narrative Details) - USD ($)	Apr. 30, 2013	Apr. 18, 2013	Jan. 24, 2013	Mar. 31, 2013
Financing Activities And Stock Transactions [Abstract]
Stock Repurchase Program Authorized Amount		$ 100,000,000	$ 200,000,000
Treasury Stock Shares Acquired	892,047			815,011
Treasury Stock Value Acquired Cost Method	$ 52,400,000			$ 47,600,000

- Definition

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

+ References + Details

Investments (Details 14) - USD ($)	Mar. 31, 2013	Dec. 31, 2012
Credit Quality Indicators [Line Items]
Loans Receivable Commercial Real Estate	$ 2,335,115,000	$ 2,312,167,000
High Investment Grade [Member]
Credit Quality Indicators [Line Items]
Loans Receivable Commercial Real Estate	1,473,018,000	1,235,605,000
Investment Grade [Member]
Credit Quality Indicators [Line Items]
Loans Receivable Commercial Real Estate	622,794,000	834,494,000
Average [Member]
Credit Quality Indicators [Line Items]
Loans Receivable Commercial Real Estate	147,650,000	132,607,000
Watch List [Member]
Credit Quality Indicators [Line Items]
Loans Receivable Commercial Real Estate	62,679,000	76,463,000
In Or Near Default [Member]
Credit Quality Indicators [Line Items]
Loans Receivable Commercial Real Estate	$ 28,974,000	$ 32,998,000

- Definition

+ References

+ Details

Segment Information

3 Months Ended

Mar. 31, 2013

Segment Information Statement [Abstract]

Segment Information

7. Segment Information

The accounting policies of the segments are the same as those described in the Summary of Significant Accounting Policies in Note 2 of the consolidated financial statements accompanying the 2012 Annual Report. The Company measures segment performance primarily based on profit or loss from operations before income taxes. There are no intersegment reinsurance transactions and the Company does not have any material long-lived assets. Investment income is allocated to the segments based upon average assets and related capital levels deemed appropriate to support the segment business volumes.

The Company allocates capital to its segments based on an internally developed economic capital model, the purpose of which is to measure the risk in the business and to provide a basis upon which capital is deployed. The economic capital model considers the unique and specific nature of the risks inherent in the Company's businesses. As a result of the economic capital allocation process, a portion of investment income and investment related gains and losses are attributed to the segments based on the level of allocated capital. In addition, the segments are charged for excess capital utilized above the allocated economic capital basis. This charge is included in policy acquisition costs and other insurance expenses.

The Company's reportable segments are strategic business units that are primarily segregated by geographic region. Information related to revenues, income (loss) before income taxes and total assets of the Company for each reportable segment are summarized below (dollars in thousands).

	Three months ended March 31,
Total revenues:	2013		2012
U.S.	$	1,500,264	$	1,324,147
Canada		297,089		275,623
Europe & South Africa		339,229		308,337
Asia Pacific		388,969		359,685
Corporate and Other		75,551		25,183
Total	$	2,601,102	$	2,292,975

	Three months ended March 31,
Income (loss) before income taxes:	2013		2012
U.S.	$	174,409	$	92,745
Canada		36,308		55,063
Europe & South Africa		17,385		6,606
Asia Pacific		14,518		32,067
Corporate and Other		36,207		(5,718)
Total	$	278,827	$	180,763


Total Assets:	March 31, 2013		December 31, 2012
U.S.	$	24,802,143	$	24,924,363
Canada		3,946,500		3,764,002
Europe & South Africa		2,137,397		2,235,199
Asia Pacific		3,051,842		3,208,732
Corporate and Other		6,259,219		6,228,142
Total	$	40,197,101	$	40,360,438

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 131
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8981-108599

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 35
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8984-108599

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9054-108599

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 40
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9031-108599

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8924-108599

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8538-108599

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8906-108599

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 29
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8864-108599

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8971-108599

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 26
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8844-108599

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8380-108599

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8595-108599

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8933-108599

+ Details

Retrocession Arrangements and Reinsurance Ceded Receivables (Narrative Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Retrocession Arrangements And Reinsurance Ceded Receivables [Abstract]
Retrocession Pool Participants Minimum AM Best Rating	A- (excellent)	A- (excellent)
Reinsurance Claims Recoverables	$ 156,400,000	$ 156,000,000
Claims Recoverable From Retrocessionaires Past Due	$ 16,600,000	$ 10,400,000

Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2013

Earnings Per Share [Abstract]

Schedule Of Earnings Per Share Basic And Diluted By Common Class [Text Block]

			Three months ended
		March 31,
			2013		2012
Earnings:
	Net income (numerator for basic and diluted calculations)	$	185,535	$	123,318
Shares:
	Weighted average outstanding shares (denominator for basic calculation)		73,838		73,575
	Equivalent shares from outstanding stock options		551		468
	Denominator for diluted calculation		74,389		74,043
Earnings per share:
	Basic	$	2.51	$	1.68
	Diluted	$	2.49	$	1.67

Commitments and Contingent Liabilities

3 Months Ended

Mar. 31, 2013

Commitments and Contingent Liabilities Statement [Abstract]

Commitments and Contingent Liabilities

8. Commitments and Contingent Liabilities

At March 31, 2013, the Company's commitments to fund investments were $166.8 million in limited partnerships, $22.2 million in commercial mortgage loans and $80.5 million in bank loans, including revolving credit agreements. At December 31, 2012, the Company's commitments to fund investments were $176.7 million in limited partnerships, $22.2 million in commercial mortgage loans and $68.5 million in bank loans, including revolving credit agreements. The Company anticipates that the majority of its current commitments will be invested over the next five years; however, these commitments could become due any time at the request of the counterparties. Investments in limited partnerships and private placements are carried at cost or reported using the equity method and included in other invested assets in the condensed consolidated balance sheets. Bank loans are carried at fair value and included in fixed maturities available-for-sale.

The Company is subject to litigation in the normal course of its business. The Company currently has no material litigation. A legal reserve is established when the Company is notified of an arbitration demand or litigation or is notified that an arbitration demand or litigation is imminent, it is probable that the Company will incur a loss as a result and the amount of the probable loss is reasonably capable of being estimated.

The Company has obtained bank letters of credit in favor of various affiliated and unaffiliated insurance companies from which the Company assumes business. These letters of credit represent guarantees of performance under the reinsurance agreements and allow ceding companies to take statutory reserve credits. Certain of these letters of credit contain financial covenant restrictions. At March 31, 2013 and December 31, 2012, there were approximately $60.3 million and $45.4 million, respectively, of undrawn outstanding bank letters of credit in favor of third parties. Additionally, the Company utilizes letters of credit to secure reserve credits when it retrocedes business to its subsidiaries, including Parkway Reinsurance Company (“Parkway Re”), Rockwood Reinsurance Company (“Rockwood Re”), Timberlake Financial L.L.C. (“Timberlake Financial”), RGA Americas Reinsurance, Ltd. (“RGA Americas”), RGA Reinsurance Company (Barbados) Ltd. (“RGA Barbados”) and RGA Atlantic Reinsurance Company, Ltd. (“RGA Atlantic”). The Company cedes business to its affiliates to help reduce the amount of regulatory capital required in certain jurisdictions such as the U.S. and the United Kingdom. The capital required to support the business in the affiliates reflects more realistic expectations than the original jurisdiction of the business, where capital requirements are often considered to be quite conservative. As of March 31, 2013 and December 31, 2012, $864.5 million and $763.5 million, respectively, in undrawn letters of credit from various banks were outstanding, backing reinsurance between the various subsidiaries of the Company. The banks providing letters of credit to the Company are included on the National Association of Insurance Commissioners (“NAIC”) list of approved banks.

The Company maintains four credit facilities, a syndicated revolving credit facility with a capacity of $850.0 million and three letter of credit facilities with a combined capacity of $590.0 million. The Company may borrow cash and obtain letters of credit in multiple currencies under its syndicated revolving credit facility. The following table provides additional information on the Company's credit facilities as of March 31, 2013 and December 31, 2012 (dollars in millions):

			Amount Utilized⁽¹⁾
	Facility Capacity	Maturity Date	March 31, 2013		December 31, 2012		Basis of Fees
	$850.0	December 2015	$	140.0	$	402.9	Senior unsecured long-term debt rating
	$200.0	September 2019		200.0		200.0	Fixed
	$120.0	May 2016		100.0		100.0	Fixed
	$270.0	November 2017		270.0		--	Fixed

(1)	Represents issued but undrawn letters of credit. There was no cash borrowed for the periods presented.

RGA has issued guarantees to third parties on behalf of its subsidiaries for the payment of amounts due under certain reinsurance treaties, securities borrowing arrangements, financing arrangements and office lease obligations, whereby, if a subsidiary fails to meet an obligation, RGA or one of its other subsidiaries will make a payment to fulfill the obligation. In limited circumstances, treaty guarantees are granted to ceding companies in order to provide them additional security, particularly in cases where RGA's subsidiary is relatively new, unrated, or not of a significant size, relative to the ceding company. Liabilities supported by the treaty guarantees, before consideration for any legally offsetting amounts due from the guaranteed party, totaled $701.0 million and $686.0 million as of March 31, 2013 and December 31, 2012, respectively, and are reflected on the Company's condensed consolidated balance sheets in future policy benefits. As of March 31, 2013 and December 31, 2012, the Company's exposure related to treaty guarantees, net of assets held in trust, was $481.7 million and $463.5 million, respectively. Potential guaranteed amounts of future payments will vary depending on production levels and underwriting results. Guarantees related to borrowed securities provide additional security to third parties should a subsidiary fail to make principal and/or interest payments when due. As of March 31, 2013 and December 31, 2012, RGA's obligation related to borrowed securities guarantees was $87.5 million. There were no amounts guaranteed under financing arrangements as of March 31, 2013 and December 31, 2012.

Manor Reinsurance, Ltd. (“Manor Re”), a subsidiary of RGA, has obtained $300.0 million of collateral financing through 2020 from an international bank which enabled Manor Re to deposit assets in trust to support statutory reserve credits for an affiliated reinsurance transaction. The bank has recourse to RGA should Manor Re fail to make payments or otherwise not perform its obligations under this financing.

The Company, through a wholly-owned subsidiary, has committed to provide statutory reserve support to a third-party through 2035, in exchange for a fee, by funding a loan if certain defined events occur. Such statutory reserves are required under the U.S. Valuation of Life Policies Model Regulation (commonly referred to as Regulation XXX for term life insurance policies and Regulation A-XXX for universal life secondary guarantees). The maximum potential obligation under this commitment is $560.0 million. The third-party has recourse to RGA should the subsidiary fail to provide the required funding, however, as of March 31, 2013, the Company does not believe that it will be required to provide any funding under this commitment as the occurrence of the defined events is considered remote.

In addition, the Company indemnifies its directors and officers as provided in its charters and by-laws. Since this indemnity generally is not subject to limitation with respect to duration or amount, the Company does not believe that it is possible to determine the maximum potential amount due under this indemnity in the future.

- Definition

The entire disclosure for commitments and contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 14
-Paragraph 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9, 10, 11, 12
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25287-109308

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6449706&loc=d3e16207-108621

+ Details

Commitments and Contingent Liabilities (Narrative Details) - USD ($)	Mar. 31, 2013	Dec. 31, 2012
Commitments And Contingent Liabilities [Line Items]
Undrawn outstanding letters of credit in favor of third parties	$ 60,300,000	$ 45,400,000
Undrawn outstanding letters of credit between subsidiaries	864,500,000	763,500,000
Syndicated revolving credit facility capacity	850,000,000
Insurance Treaty Guarantee [Member]
Commitments And Contingent Liabilities [Line Items]
Guarantee Obligations Current Carrying Value	701,000,000	686,000,000
Insurance Treaty Guarantee Net Of Assets Held In Trust [Member]
Commitments And Contingent Liabilities [Line Items]
Guarantee Obligations Current Carrying Value	481,700,000	463,500,000
Guarantee Of Borrowed Securities [Member]
Commitments And Contingent Liabilities [Line Items]
Guarantee Obligations Current Carrying Value	87,500,000
Guarantee Of Subsidiary Collateral Financing [Member]
Commitments And Contingent Liabilities [Line Items]
Guarantee Obligations Current Carrying Value	300,000,000
Limited Partnerships [Member]
Commitments And Contingent Liabilities [Line Items]
Unfunded commitments to fund partnership investments, mortgage loans and private corporate bond investments	166,800,000	176,700,000
Commercial Mortgage Loans [Member]
Commitments And Contingent Liabilities [Line Items]
Unfunded commitments to fund partnership investments, mortgage loans and private corporate bond investments	22,200,000	22,200,000
Private Placement Investments [Member]
Commitments And Contingent Liabilities [Line Items]
Unfunded commitments to fund partnership investments, mortgage loans and private corporate bond investments	0	0
Bank Loans [Member]
Commitments And Contingent Liabilities [Line Items]
Unfunded commitments to fund partnership investments, mortgage loans and private corporate bond investments	$ 80,500,000	$ 68,500,000

Investments (Details 20) - USD ($)	Mar. 31, 2013	Dec. 31, 2012
Derivative Assets [Abstract]
Derivative Fair Value Of Derivative Asset	$ 175,236,000	$ 190,634,000
Derivative Asset Fair Value Gross Liability	(23,475,000)	(22,426,000)
Derivative Assets	151,761,000	168,208,000
Derivative Asset Fair Value Of Collateral	(17,664,000)	(22,458,000)
Derivative Collateral Obligation To Return Cash	(126,329,000)	(136,414,000)
Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral	7,768,000	9,336,000
Derivative Liabilities [Abstract]
Derivative Fair Value Of Free Standing Derivative Liability	42,079,000	54,078,000
Derivative Liability Fair Value Gross Asset	(23,475,000)	(22,426,000)
Derivative Liabilities	18,604,000	31,652,000
Derivative Liability Fair Value Of Collateral	(14,118,000)	(1,565,000)
Derivative Collateral Right To Reclaim Cash	(6,250,000)	(27,867,000)
Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral	$ (1,764,000)	$ 2,220,000

Investments (Details 6)	3 Months Ended
Investments (Details 6)	Mar. 31, 2013 USD ($)
Certain Loans Acquired in Transfer Accounted for as Available-for-sale Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance, beginning of period	$ 39,239,000
Certain Loans Acquired in Transfer Accounted for as Available-for-sale Debt Securities, Accretable Yield, Additions	22,066,000
Certain Loans Acquired in Transfer Accounted for as Available-for-sale Debt Securities, Accretable Yield, Accretion	(1,943,000)
Certain Loans Acquired in Transfer Accounted for as Available-for-sale Debt Securities, Accretable Yield, Disposals of Loans	0
Certain Loans Acquired in Transfer Accounted for as Available-for-sale Debt Securities, Accretable Yield, Reclassifications to Nonaccretable Difference	553,000
Balance, end of period	$ 59,915,000

Investments (Details 1) - USD ($)	Mar. 31, 2013	Dec. 31, 2012
Available For Sale Securities Debt Maturities Amortized Cost
Due in one year or less	$ 348,130,000
Due after one year through five years	3,716,625,000
Due after five year through ten years	6,922,683,000
Due after ten years	5,497,340,000
Asset and mortgage-backed securities	3,354,171,000
Total	19,838,949,000	$ 19,559,432,000
Available For Sale Securities Debt Maturities Fair Value
Due in one year or less	352,916,000
Due after one year through five years	3,917,468,000
Due after five year through ten years	7,521,433,000
Due after ten years	7,078,384,000
Asset and mortgage-backed securities	3,531,458,000
Total	$ 22,401,659,000	$ 22,291,614,000

Investments (Details 8) - USD ($)	Mar. 31, 2013	Dec. 31, 2012
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	$ 46,300,000	$ 61,500,000
Fixed Maturities Member
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	2,079,630,000	1,445,262,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	34,480,000	22,324,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	365,855,000	414,211,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	86,215,000	109,930,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	2,445,485,000	1,859,473,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	120,695,000	132,254,000
Equity Securities [Member]
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	118,072,000	90,951,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	1,836,000	1,186,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	1,000	5,679,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	1,000	118,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	118,073,000	96,630,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	1,837,000	1,304,000
External Credit Rating Investment Grade Member \| Fixed Maturities Member
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	1,894,982,000	1,242,157,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	31,018,000	18,284,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	234,367,000	272,112,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	34,495,000	42,960,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	2,129,349,000	1,514,269,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	65,513,000	61,244,000
External Credit Rating Non Investment Grade Member \| Fixed Maturities Member
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	184,648,000	203,105,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	3,462,000	4,040,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	131,488,000	142,099,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	51,720,000	66,970,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	316,136,000	345,204,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	55,182,000	71,010,000
Corporate Debt Securities Member \| External Credit Rating Investment Grade Member \| Fixed Maturities Member
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	1,187,238,000	786,203,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	25,066,000	13,276,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	89,284,000	108,187,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	11,614,000	17,386,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	1,276,522,000	894,390,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	36,680,000	30,662,000
Corporate Debt Securities Member \| External Credit Rating Non Investment Grade Member \| Fixed Maturities Member
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	155,261,000	181,168,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	2,961,000	3,170,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	30,763,000	39,123,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	5,452,000	5,501,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	186,024,000	220,291,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	8,413,000	8,671,000
US Government Agencies Debt Securities Member \| External Credit Rating Investment Grade Member \| Fixed Maturities Member
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	56,975,000	7,272,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	132,000	24,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	0	0
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	0	0
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	56,975,000	7,272,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	132,000	24,000
US States And Political Subdivisions Member \| External Credit Rating Investment Grade Member \| Fixed Maturities Member
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	30,734,000	20,602,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	266,000	1,514,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	11,463,000	11,736,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	5,480,000	4,132,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	42,197,000	32,338,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	5,746,000	5,646,000
US States And Political Subdivisions Member \| External Credit Rating Non Investment Grade Member \| Fixed Maturities Member
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	0	0
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	0	0
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	0	0
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	0	0
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	0	0
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	0	0
Other Foreign Government, Supranational And Foreign Government-Sponsored Enterprises \| External Credit Rating Investment Grade Member \| Fixed Maturities Member
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	335,216,000	244,817,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	2,809,000	1,953,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	7,375,000	7,435,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	744,000	761,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	342,591,000	252,252,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	3,553,000	2,714,000
Other Foreign Government, Supranational And Foreign Government-Sponsored Enterprises \| External Credit Rating Non Investment Grade Member \| Fixed Maturities Member
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	1,034,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	32,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	0
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	0
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	1,034,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	32,000
Commercial Mortgage Backed Securities Member \| External Credit Rating Investment Grade Member \| Fixed Maturities Member
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	79,509,000	89,507,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	471,000	797,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	21,920,000	29,181,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	6,521,000	7,974,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	101,429,000	118,688,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	6,992,000	8,771,000
Commercial Mortgage Backed Securities Member \| External Credit Rating Non Investment Grade Member \| Fixed Maturities Member
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	0	3,317,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	0	764,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	66,674,000	68,405,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	34,904,000	42,307,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	66,674,000	71,722,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	34,904,000	43,071,000
Residential Mortgage Backed Securities Member \| External Credit Rating Investment Grade Member \| Fixed Maturities Member
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	54,738,000	22,288,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	469,000	97,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	17,664,000	19,394,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	2,920,000	3,199,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	72,402,000	41,682,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	3,389,000	3,296,000
Residential Mortgage Backed Securities Member \| External Credit Rating Non Investment Grade Member \| Fixed Maturities Member
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	18,215,000	15,199,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	298,000	80,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	4,681,000	2,633,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	354,000	347,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	22,896,000	17,832,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	652,000	427,000
Asset Backed Securities Member \| External Credit Rating Investment Grade Member \| Fixed Maturities Member
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	91,530,000	59,119,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	672,000	449,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	86,661,000	96,179,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	7,216,000	9,508,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	178,191,000	155,298,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	7,888,000	9,957,000
Asset Backed Securities Member \| External Credit Rating Non Investment Grade Member \| Fixed Maturities Member
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	10,138,000	3,421,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	171,000	26,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	29,370,000	31,938,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	11,010,000	18,815,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	39,508,000	35,359,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	11,181,000	18,841,000
Canadian Provincial Governments [Member] \| External Credit Rating Investment Grade Member \| Fixed Maturities Member
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	59,042,000	12,349,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	1,133,000	174,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	0	0
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	0	0
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	59,042,000	12,349,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	1,133,000	174,000
Nonredeemable Preferred Stock Member \| Equity Securities [Member]
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	7,885,000	5,577,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	7,000	52,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	1,000	5,679,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	1,000	118,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	7,886,000	11,256,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	8,000	170,000
Equity Securities Other Member \| Equity Securities [Member]
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	110,187,000	85,374,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	1,829,000	1,134,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	0	0
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	0	0
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	110,187,000	85,374,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	$ 1,829,000	$ 1,134,000

Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2013	Apr. 30, 2013
Document And Entitiy Information [Abstract]
Document Type	10-Q
Document period end date	Mar. 31, 2013
Amendment flag	false
Entity registrant name	REINSURANCE GROUP OF AMERICA INC
Entity central index key	0000898174
Entity current reporting status	Yes
Entity voluntary filers	No
Current fiscal year end date	--12-31
Entity filer category	Large Accelerated Filer
Entity well known seasoned issuer	Yes
Common Shares Outstanding		72,499,239
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q1

Comprehensive Income (Details) - USD ($)	3 Months Ended
Comprehensive Income (Details) - USD ($)	Mar. 31, 2013	Mar. 31, 2012
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]
Balance, Beginning of Period	$ 2,108,902,000	$ 1,618,153,000
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	(126,717,000)
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax	(5,445,000)
Other Comprehensive Income Loss Net Of Tax	(132,162,000)
Change in component during the period		(6,351,000)
Balance, End of Period	1,976,740,000	1,611,802,000
Accumulated Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]
Balance, Beginning of Period	267,475,000	229,795,000
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	(14,105,000)
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax	0
Other Comprehensive Income Loss Net Of Tax	(14,105,000)
Change in component during the period		24,080,000
Balance, End of Period	253,370,000	253,875,000
Unrealized Appreciation Of Securities [Member]
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]
Balance, Beginning of Period	1,877,657,000	1,419,318,000
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	(112,711,000)
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax	(6,171,000)
Other Comprehensive Income Loss Net Of Tax	(118,882,000)
Change in component during the period		(30,721,000)
Balance, End of Period	1,758,775,000	1,388,597,000
Pension And Postretirement Benefits [Member]
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]
Balance, Beginning of Period	(36,230,000)	(30,960,000)
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	99,000
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax	726,000
Other Comprehensive Income Loss Net Of Tax	825,000
Change in component during the period		290,000
Balance, End of Period	$ (35,405,000)	$ (30,670,000)

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

+ Details

New Accounting Standards

3 Months Ended

Mar. 31, 2013

New Accounting Standards [Abstract]

New Accounting Standards

14. New Accounting Standards

Changes to the general accounting principles are established by the FASB in the form of accounting standards updates to the FASB Accounting Standards Codification™. Accounting standards updates not listed below were assessed and determined to be either not applicable or are expected to have minimal impact on the Company's consolidated financial statements.

Adoption of New Accounting Standards

Basis of Presentation

In December 2011, the FASB amended the general accounting principles for Balance Sheet as it relates to the disclosures about offsetting assets and liabilities. The amendment requires disclosures about the Company's rights of offset and related arrangements associated with its financial instruments and derivative instruments. This amendment also requires the disclosure of both gross and net information about both instruments and transactions eligible for offset in the balance sheet and instruments and transactions subject to an agreement similar to a master netting arrangement. In January 2013, the FASB amended the general accounting principles for Balance Sheet as it relates to the disclosures about offsetting assets and liabilities. This amendment clarifies that the scope of the Balance Sheet amendment made in December 2011 applies only to derivatives, including bifurcated embedded derivatives, repurchase and reverse repurchase agreements, and securities borrowing and lending transactions that are either offset or subject to an enforceable master netting agreement or a similar agreement. These amendments are effective for interim and annual reporting periods beginning on or after January 1, 2013. The Company adopted these amendments and the required disclosures are provided in Note 4 — “Investments.”

Transfers and Servicing

In April 2011, the FASB amended the general accounting principles for Transfers and Servicing as it relates to the reconsideration of effective control for repurchase agreements. This amendment removes from the assessment of effective control the criterion requiring the transferor to have the ability to repurchase or redeem the financial assets and also removes the collateral maintenance implementation guidance related to that criterion. The amendment is effective for interim and annual periods beginning after December 15, 2011. The adoption of this amendment did not have an impact on the Company's condensed consolidated financial statements.

Fair Value Measurements and Disclosures

In May 2011, the FASB amended the general accounting principles for Fair Value Measurements and Disclosures as it relates to the measurement and disclosure requirements about fair value measurements. This amendment clarifies the FASB's intent about the application of existing fair value measurement requirements. It also changes particular principles and requirements for measuring fair value and for disclosing information about fair value measurements. The amendment is effective for interim and annual periods beginning after December 15, 2011. The Company adopted this amendment and the required disclosures are provided in Note 6 — “Fair Value of Assets and Liabilities.”

Deferred Policy Acquisition Costs

In October 2010, the FASB amended the general accounting principles for Financial Services – Insurance as it relates to accounting for costs associated with acquiring or renewing insurance contracts. This amendment clarifies that only those costs that result directly from and are essential to the contract transaction and that would not have been incurred had the contract transaction not occurred can be capitalized. It also defines acquisitions costs as costs that are related directly to the successful acquisitions of new or renewal insurance contracts. The amendment is effective for fiscal years and interim periods beginning after December 15, 2011. The retrospective adoption of this amendment on January 1, 2012, resulted in a reduction in the Company's deferred acquisition cost asset and a corresponding reduction to equity, reflected in the financial statements in all periods. There will be a decrease in amortization subsequent to adoption due to the reduced deferred acquisition cost asset. There has also been a reduction in the level of future costs the Company defers; thereby increasing expenses incurred in future periods. The cumulative effect of the adoption of this amendment was a decrease to total stockholders' equity of $318.4 million and a decrease in the deferred policy acquisition costs balance of $470.1 million on January 1, 2012.

Comprehensive Income

In February 2013, the FASB amended the general accounting principles for Comprehensive Income as it relates to the reporting of amounts reclassified out of accumulated other comprehensive income. The amendment requires entities to provide information about the amounts reclassified out of accumulated other comprehensive income by component. This amendment also requires entities to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income. However, this is only necessary if the amount reclassified is required to be reclassified to net income in its entirety in the same reporting period. The amendment is effective for interim and annual reporting periods beginning after December 31, 2012. The Company adopted this amendment and the required disclosures are provided in Note 3 — “Accumulated Other Comprehensive Income.”

In June 2011, the FASB amended the general accounting principles for Comprehensive Income as it relates to the presentation of comprehensive income. This amendment requires entities to present the total of comprehensive income, the components of net income, and the components of other comprehensive income in either a continuous statement of comprehensive income or in two separate but consecutive statements. The amendment does not change the items that must be reported in other comprehensive income. In December 2011, the FASB amended the general accounting principles for Comprehensive Income as it relates to the presentation of comprehensive income. This amendment defers the requirement to present the effects of reclassifications out of accumulated other comprehensive income on the Company's consolidated statements of income, which was required in the Comprehensive Income amendment made in June 2011. These amendments are effective for fiscal years, and interim periods within those years, beginning after December 15, 2011. The Company adopted these amendments and the required presentation is provided in the Condensed Consolidated Statements of Comprehensive Income.

Employee Benefit Plans (Details) - USD ($)	3 Months Ended
Employee Benefit Plans (Details) - USD ($)	Mar. 31, 2013	Mar. 31, 2012
Pension Plans Defined Benefit Member
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Service Cost	$ 1,883,000	$ 1,532,000
Defined Benefit Plan Interest Cost	1,018,000	980,000
Expected return on plan assets	(767,000)	(734,000)
Defined Benefit Plan Amortization Of Prior Service Cost Credit	94,000	99,000
Amortization of prior actuarial loss	837,000	275,000
Total	3,065,000	2,152,000
Other Postretirement Benefit Plans Defined Benefit Member
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Service Cost	410,000	279,000
Defined Benefit Plan Interest Cost	312,000	259,000
Expected return on plan assets	0	0
Defined Benefit Plan Amortization Of Prior Service Cost Credit	0	0
Amortization of prior actuarial loss	186,000	88,000
Total	$ 908,000	$ 626,000

- Definition

An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

+ References

+ Details

- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

+ References + Details

- Definition

The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 106
-Paragraph 518
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph a, h
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Service Cost (Component of Net Periodic Pension Cost)
-URI http://asc.fasb.org/extlink&oid=6525008

+ Details

CONDENSED CONSOLIDATED BALANCE SHEETS PARENTHETICAL - USD ($)	Mar. 31, 2013	Dec. 31, 2012
Condensed Consolidated Balance Sheets Parentheticals [Abstract]
Available for Sale at Fair value - Amortized cost	$ 19,838,949,000	$ 19,559,432,000
Preferred stock par value	$ 0.01	$ 0.01
Preferred stock shares authorized	10,000,000	10,000,000
Common stock par value	$ 0.01	$ 0.01
Common stock shares authorized	140,000,000	140,000,000
Common stock shares issued	79,137,758	79,137,758
Common stock shares outstanding	73,300,797	73,927,331
Treasury Shares Held	5,836,961	5,210,427
Allowances for Loan and Lease Losses, Real Estate	$ 9,924,000	$ 11,580,000

Organization and Basis of Presentation

3 Months Ended

Mar. 31, 2013

Organization And Basis Of Presentation [Abstract]

Organization and Basis of Presentation

1. Organization and Basis of Presentation

Reinsurance Group of America, Incorporated ("RGA") is an insurance holding company that was formed on December 31, 1992. The accompanying unaudited condensed consolidated financial statements of RGA and its subsidiaries (collectively, the "Company") have been prepared in conformity with accounting principles generally accepted in the United States of America for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, these financial statements do not include all of the information and footnotes required by accounting principles generally accepted in the United States of America for complete financial statements. In the opinion of management, all adjustments, consisting of normal recurring accruals, considered necessary for a fair presentation have been included. Results for the three months ended March 31, 2013 are not necessarily indicative of the results that may be expected for the year ending December 31, 2013. There were no subsequent events that would require disclosure or adjustments to the accompanying condensed consolidated financial statements through the date the financial statements were issued. These unaudited condensed consolidated financial statements include the accounts of RGA and its subsidiaries, all intercompany accounts and transactions have been eliminated. They should be read in conjunction with the Company's 2012 Annual Report on Form 10-K (“2012 Annual Report”) filed with the Securities and Exchange Commission (“SEC”) on March 1, 2013.

- Definition

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 2-6
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Name Statement of Position (SOP)
-Publisher AICPA
-Number 94-6
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Name FASB Interpretation (FIN)
-Publisher FASB
-Number 46R
-Paragraph 4, 14, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6359553&loc=d3e288-107754

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2197480

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6921930&loc=d3e5614-111684

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 915
-SubTopic 235
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6472506&loc=d3e38932-110933

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2209116

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6970148&loc=SL6228881-111685

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2122150

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6359566&loc=d3e326-107755

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 720
-SubTopic 15
-URI http://asc.fasb.org/subtopic&trid=2122524

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2134480

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS140-4/FIN46(R)-8
-Paragraph 8, C1, C7
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Investments (Details 5)	Mar. 31, 2013 USD ($)
Certain Loans Acquired in Transfer Accounted for as Available-for-sale Debt Securities, Acquired During Period [Abstract]
Certain Loans Acquired in Transfer Accounted for as Available-for-sale Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition	$ 91,863,000
Certain Loans Acquired in Transfer Accounted for as Available-for-sale Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition	72,940,000
Certain Loans Acquired in Transfer Accounted for as Available-for-sale Debt Securities, Acquired During Period, at Acquisition, at Fair Value	$ 50,874,000

Fair Value Disclosures (Tables)

3 Months Ended

Mar. 31, 2013

Fair Value Of Financial Instruments [Abstract]

Schedule Of Fair Value Assets And Liabilities Measured On Recurring Basis Table Text Block

March 31, 2013:								Fair Value Measurements Using:
						Total		Level 1		Level 2		Level 3
Assets:
	Fixed maturity securities – available-for-sale:
		Corporate securities			$	12,441,501	$	65,890	$	10,728,708	$	1,646,903
		Canadian and Canadian provincial governments				3,942,198		--		3,942,198		--
		Residential mortgage-backed securities				1,076,770		--		936,053		140,717
		Asset-backed securities				756,544		--		468,313		288,231
		Commercial mortgage-backed securities				1,698,144		--		1,522,850		175,294
		U.S. government and agencies securities				331,201		259,892		71,309		--
		State and political subdivision securities				313,097		--		270,458		42,639
		Other foreign government supranational and foreign
			government-sponsored enterprises			1,842,204		272,823		1,541,516		27,865
				Total fixed maturity securities – available-for-sale		22,401,659		598,605		19,481,405		2,321,649
	Funds withheld at interest – embedded derivatives					(156,189)		--		--		(156,189)
	Cash equivalents					367,876		367,876		--		--
	Short-term investments					157,281		118,621		16,659		22,001
	Other invested assets:
		Non-redeemable preferred stock				84,111		73,446		10,665		--
		Other equity securities				136,554		136,554		--		--
		Derivatives:
			Interest rate swaps			83,662		--		83,662		--
			Interest rate options			16,054		--		16,054		--
			CPI swaps			945		--		945		--
			Credit default swaps			(3,391)		--		(3,391)		--
			Equity options			54,351		--		54,351		--
			Foreign currency swaps			140		--		140		--
		Collateral				25,790		14,118		11,672		--
		Other				7,205		7,205		--		--
				Total other invested assets		405,421		231,323		174,098		--
		Total			$	23,176,048	$	1,316,425	$	19,672,162	$	2,187,461

Liabilities:
	Interest sensitive contract liabilities – embedded derivatives				$	890,476	$	--	$	--	$	890,476
	Other liabilities:
		Derivatives:
			Interest rate swaps			1,463		--		1,463		--
			Foreign currency forwards			7,014		--		7,014		--
			Credit default swaps			(120)		--		(120)		--
			Equity options			(440)		--		(440)		--
			Foreign currency swaps			10,687		--		10,687		--
		Total			$	909,080	$	--	$	18,604	$	890,476

December 31, 2012:								Fair Value Measurements Using:
						Total		Level 1		Level 2		Level 3
Assets:
	Fixed maturity securities – available-for-sale:
		Corporate securities			$	12,380,071	$	43,544	$	10,667,964	$	1,668,563
		Canadian and Canadian provincial governments				4,049,334		--		4,049,334		--
		Residential mortgage-backed securities				1,042,064		--		948,133		93,931
		Asset-backed securities				691,555		--		459,164		232,391
		Commercial mortgage-backed securities				1,698,903		--		1,531,897		167,006
		U.S. government and agencies securities				265,190		192,780		67,872		4,538
		State and political subdivision securities				302,498		--		259,286		43,212
		Other foreign government, supranational and foreign
			government-sponsored enterprises			1,861,999		297,025		1,536,694		28,280
				Total fixed maturity securities – available-for-sale		22,291,614		533,349		19,520,344		2,237,921
	Funds withheld at interest – embedded derivatives					(243,177)		--		--		(243,177)
	Cash equivalents					575,864		575,864		--		--
	Short-term investments					239,131		178,923		38,177		22,031
	Other invested assets:
		Non-redeemable preferred stock				74,841		64,268		10,573		--
		Other equity securities				147,859		147,859		--		--
		Derivatives:
			Interest rate swaps			104,972		--		104,972		--
			Foreign currency forwards			1,017		--		1,017		--
			CPI swaps			1,446		--		1,446		--
			Credit default swaps			(1,741)		--		(1,741)		--
			Equity options			62,514		--		62,514		--
		Collateral				17,002		1,323		15,679		--
		Other				11,951		11,951		--		--
				Total other invested assets		419,861		225,401		194,460		--
		Total			$	23,283,293	$	1,513,537	$	19,752,981	$	2,016,775

Liabilities:
	Interest sensitive contract liabilities – embedded derivatives				$	912,361	$	--	$	--	$	912,361
	Other liabilities:
		Derivatives:
			Interest rate swaps			196		--		196		--
			Foreign currency forwards			2,105		--		2,105		--
			Credit default swaps			1,953		--		1,953		--
			Foreign currency swaps			27,398		--		27,398		--
		Total			$	944,013	$	--	$	31,652	$	912,361

Fair Value Unobservable Input Measurements [Table Text Block]

March 31, 2013:				Valuation	Unobservable	Range
		Fair Value		Technique(s)	Input	(Weighted Average)
Assets:
	State and political subdivision securities	$	5,364	Market comparable securities	Liquidity premium	1%

	Corporate securities		429,817	Market comparable securities	Liquidity premium	0-2% (1%)

	Short-term investments		22,001	Market comparable securities	Liquidity premium	1%

	Funds withheld at interest- embedded derivatives		(156,189)	Total return swap	Mortality	0-100% (1%)
					Lapse	0-35% (6%)
					Withdrawal	0-5% (3%)
					Own Credit	0-1% (1%)
					Crediting rate	2-4% (3%)

Liabilities:
	Interest sensitive contract liabilities- embedded derivatives- indexed annuities		769,685	Discounted cash flow	Mortality	0-100% (1%)
					Lapse	0-35% (6%)
					Withdrawal	0-5% (3%)
					Option budget projection	2-4% (3%)



March 31, 2013 (continued):				Valuation	Unobservable	Range
		Fair Value		Technique(s)	Input	(Weighted Average)
	Interest sensitive contract liabilities- embedded derivatives- variable annuities		120,791	Discounted cash flow	Mortality	0-100% (2%)
					Lapse	0-25% (5%)
					Withdrawal	0-7% (3%)
					Own Credit	0-1% (1%)
					Long-term volatility	0-27% (13%)

December 31, 2012:				Valuation	Unobservable	Range
		Fair Value		Technique(s)	Input	(Weighted Average)
Assets:
	State and political subdivision securities	$	5,451	Market comparable securities	Liquidity premium	1%

	Corporate securities		450,177	Market comparable securities	Liquidity premium	0-2% (1%)

	Short-term investments		22,031	Market comparable securities	Liquidity premium	1%

	Funds withheld at interest- embedded derivatives		(243,177)	Total return swap	Mortality	0-100% (1%)
					Lapse	0-35% (6%)
					Withdrawal	0-5% (3%)
					Own Credit	0-1% (1%)
					Crediting rate	2-4% (3%)
Liabilities:
	Interest sensitive contract liabilities- embedded derivatives- indexed annuities		740,256	Discounted cash flow	Mortality	0-100% (1%)
					Lapse	0-35% (6%)
					Withdrawal	0-5% (3%)
					Option budget projection	2-4% (3%)


	Interest sensitive contract liabilities- embedded derivatives- variable annuities		172,105	Discounted cash flow	Mortality	0-100% (2%)
					Lapse	0-25% (5%)
					Withdrawal	0-7% (3%)
					Own Credit	0-1% (1%)
					Long-term volatility	0-27% (14%)

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Level Transfers [Table Text Block]

		Three months ended March 31,
		2013				2012
		Transfers from		Transfers from		Transfers from		Transfers from
		Level 1 to		Level 2 to		Level 1 to		Level 2 to
		Level 2		Level 1		Level 2		Level 1
Fixed maturity securities - available-for-sale:
	Corporate securities	$	--	$	14,012	$	--	$	4
Total fixed maturity securities		$	--	$	14,012	$	--	$	4

Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Text Block]

For the three months ended March 31, 2013:				Fixed maturity securities - available-for-sale
							Residential				Commercial		U.S.
							mortgage-				mortgage-	Government
				Corporate			backed		Asset-backed		backed	and agencies
				securities			securities		securities		securities		securities
Fair value, beginning of period				$	1,668,563	$	93,931	$	232,391	$	167,006	$	4,538
	Total gains/losses (realized/unrealized)
		Included in earnings, net:
			Investment income, net of related expenses		(2,027)		105		878		502		--
			Investment related gains (losses), net		(1,262)		(173)		(1,747)		(870)		--
			Claims & other policy benefits		--		--		--		--		--
			Interest credited		--		--		--		--		--
			Policy acquisition costs and other insurance expenses		--		--		--		--		--
		Included in other comprehensive income			963		2,514		12,036		12,500		--
	Purchases⁽¹⁾				74,671		40,538		55,881		--		--
	Sales⁽¹⁾				(16,278)		(1,599)		(8,297)		(1,604)		--
	Settlements⁽¹⁾				(65,366)		(4,923)		(5,877)		(2,240)		--
	Transfers into Level 3				3,773		10,324		2,966		--		--
	Transfers out of Level 3				(16,134)		--		--		--		(4,538)
Fair value, end of period				$	1,646,903	$	140,717	$	288,231	$	175,294	$	--

Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
		Included in earnings, net:
			Investment income, net of related expenses	$	(2,027)	$	105	$	882	$	501	$	--
			Investment related gains (losses), net		(202)		--		--		--		--
			Claims & other policy benefits		--		--		--		--		--
			Interest credited		--		--		--		--		--
			Policy acquisition costs and other insurance expenses		--		--		--		--		--

For the three months ended March 31, 2013 (continued):				Fixed maturity securities
				available-for-sale
							Other foreign
					State		government,		Funds withheld				Interest sensitive
					and political		supranational and		at interest-				contract liabilities
					subdivision		foreign government-		embedded		Short-term		embedded
					securities		sponsored enterprises		derivative		investments		derivatives
Fair value, beginning of period					$	43,212	$	28,280	$	(243,177)	$	22,031	$	(912,361)
	Total gains/losses (realized/unrealized)
		Included in earnings, net:
			Investment income, net of related expenses			9		(75)		--		(3)		--
			Investment related gains (losses), net			(4)		--		86,988		--		51,314
			Claims & other policy benefits			--		--		--		--		--
			Interest credited			--		--		--		--		(32,996)
			Policy acquisition costs and other insurance expenses			--		--		--		--		--
		Included in other comprehensive income				(553)		(340)		--		(27)		--
	Purchases⁽¹⁾					--		--		--		--		(13,860)
	Sales⁽¹⁾					--		--		--		--		--
	Settlements⁽¹⁾					(25)		--		--		--		17,427
	Transfers into Level 3					--		--		--		--		--
	Transfers out of Level 3					--		--		--		--		--
Fair value, end of period					$	42,639	$	27,865	$	(156,189)	$	22,001	$	(890,476)

Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
		Included in earnings, net:
			Investment income, net of related expenses		$	9	$	(75)	$	--	$	(4)	$	--
			Investment related gains (losses), net			--		--		86,988		--		50,123
			Claims & other policy benefits			--		--		--		--		--
			Interest credited			--		--		--		--		(50,424)
			Policy acquisition costs and other insurance expenses			--		--		--		--		--

(1)			The amount reported within purchases, sales and settlements is the purchase price (for purchases) and the sales/settlement proceeds (for sales and settlements) based upon the actual date purchased or sold/settled. Items purchased and sold/settled in the same period are excluded from the rollforward. The Company had no issuances during the period.

For the three months ended March 31, 2012:				Fixed maturity securities - available-for-sale
							Residential				Commercial		State
							mortgage-				mortgage-		and political
				Corporate			backed		Asset-backed		backed		subdivision
				securities			securities		securities		securities		securities
Fair value, beginning of period				$	974,169	$	81,655	$	193,492	$	115,976	$	10,373
	Total gains/losses (realized/unrealized)
		Included in earnings, net:
			Investment income, net of related expenses		30		110		249		588		(5)
			Investment related gains (losses), net		(585)		279		(670)		(12,075)		(4)
			Claims & other policy benefits		--		--		--		--		--
			Interest credited		--		--		--		--		--
			Policy acquisition costs and other insurance expenses		--		--		--		--		--
		Included in other comprehensive income			(682)		1,580		6,696		13,521		406
	Purchases ⁽¹⁾				21,161		244		--		--		--
	Sales⁽¹⁾				(9,408)		(8,004)		--		--		--
	Settlements⁽¹⁾				(20,875)		(1,800)		(3,865)		--		(23)
	Transfers into Level 3				17,444		--		1,080		10,846		--
	Transfers out of Level 3				(3,583)		(19,629)		(50,620)		(10,178)		(5,508)
Fair value, end of period				$	977,671	$	54,435	$	146,362	$	118,678	$	5,239

Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
		Included in earnings, net:
			Investment income, net of related expenses	$	30	$	106	$	249	$	588	$	(5)
			Investment related gains (losses), net		(727)		(108)		(607)		(12,075)		--
			Claims & other policy benefits		--		--		--		--		--
			Interest credited		--		--		--		--		--
			Policy acquisition costs and other insurance expenses		--		--		--		--		--

For the three months ended March 31, 2012 (continued):				Funds withheld				Reinsurance		Interest sensitive
				at interest-		Other invested		ceded receivable-		contract liabilities
				embedded		assets- other		embedded		embedded
				derivatives		equity securities		derivatives		derivatives
Fair value, beginning of period				$	(361,456)	$	11,489	$	4,945	$	(1,028,241)
	Total gains/losses (realized/unrealized)
		Included in earnings, net:
			Investment income, net of related expenses		--		--		--		--
			Investment related gains (losses), net		(9,428)		--		--		146,375
			Claims & other policy benefits		--		--		--		2,278
			Interest credited		--		--		--		(21,193)
			Policy acquisition costs and other insurance expenses		--		--		(1,329)		--
		Included in other comprehensive income			--		338		--		--
	Purchases⁽¹⁾				--		--		--		(23,590)
	Sales⁽¹⁾				--		--		--		--
	Settlements⁽¹⁾				--		--		(102)		21,089
	Transfers into Level 3				--		--		--		--
	Transfers out of Level 3				--		--		--		--
Fair value, end of period				$	(370,884)	$	11,827	$	3,514	$	(903,282)

Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
		Included in earnings, net:
			Investment income, net of related expenses	$	--	$	--	$	--	$	--
			Investment related gains (losses), net		(9,428)		--		--		144,624
			Claims & other policy benefits		--		--		--		2,037
			Interest credited		--		--		--		(42,107)
			Policy acquisition costs and other insurance expenses		--		--		(1,188)		--

(1)			The amount reported within purchases, sales and settlements is the purchase price (for purchases) and the sales/settlement proceeds (for sales and settlements) based upon the actual date purchased or sold/settled. Items purchased and sold/settled in the same period are excluded from the rollforward. The Company had no issuances during the period.

Financial Instruments Carrying Amounts And Estimated Fair Value [Text Block]

March 31, 2013					Estimated Fair	Fair Value Measurement Using:
			Carrying Value		Value		Level 1	Level 2		Level 3
Assets:
	Mortgage loans on real estate	$	2,325,191	$	2,429,358	$	--	$	--	$	2,429,358
	Policy loans		1,245,812		1,245,812		--		1,245,812		--
	Funds withheld at interest⁽¹⁾		5,851,967		6,363,220		--		--		6,363,220
	Cash and cash equivalents⁽²⁾		633,965		633,965		633,965		--		--
	Short-term investments⁽²⁾		23,426		23,426		23,426		--		--
	Other invested assets⁽²⁾		552,420		589,979		--		32,250		557,729
	Accrued investment income		230,269		230,269		--		230,269		--
Liabilities:
	Interest-sensitive contract liabilities⁽¹⁾	$	11,385,069	$	11,805,623	$	--	$	--	$	11,805,623
	Long-term debt		1,815,392		2,025,511		--		--		2,025,511
	Collateral finance facility		491,987		368,625		--		--		368,625

December 31, 2012:						Estimated Fair	Fair Value Measurement Using:
				Carrying Value	Value			Level 1	Level 2		Level 3
Assets:
	Mortgage loans on real estate		$	2,300,587	$	2,426,688	$	--	$	--	$	2,426,688
	Policy loans			1,278,175		1,278,175		--		1,278,175		--
	Funds withheld at interest⁽¹⁾			5,837,359		6,362,324		--		--		6,362,324
	Cash and cash equivalents⁽²⁾			684,028		684,028		684,028		--		--
	Short-term investments⁽²⁾			48,951		48,951		48,951		--		--
	Other invested assets⁽²⁾			596,336		626,358		--		32,250		594,108
	Accrued investment income			201,344		201,344		--		201,344		--
Liabilities:
	Interest-sensitive contract liabilities⁽¹⁾		$	11,566,962	$	11,926,339	$	--	$	--	$	11,926,339
	Long-term debt			1,815,253		2,014,062		--		--		2,014,062
	Collateral finance facility			652,010		456,050		--		--		456,050

(1)		Carrying values presented herein differ from those presented in the condensed consolidated balance sheets because certain items within the respective financial statement caption are embedded derivatives and are measured at fair value on a recurring basis.

(2)		Carrying values presented herein differ from those presented in the condensed consolidated balance sheets because certain items within the respective financial statement caption are measured at fair value on a recurring basis.

Investments (Details) - USD ($)	Mar. 31, 2013	Dec. 31, 2012
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	$ 11,464,082,000	$ 11,333,431,000
Available For Sale Securities Gross Unrealized Losses	122,532,000	133,558,000
Available For Sale Securities Fair Value Disclosure	$ 12,441,501,000	$ 12,380,071,000
Percentage Of Total Available For Sale Securities	100.00%	100.00%
Fixed Maturities Member
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	$ 19,838,949,000	$ 19,559,432,000
Available For Sale Securities Gross Unrealized Gain	2,683,405,000	2,864,436,000
Available For Sale Securities Gross Unrealized Losses	120,695,000	132,254,000
Available For Sale Securities Fair Value Disclosure	22,401,659,000	22,291,614,000
Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Availableforsale Debt Securities	$ (7,931,000)	$ (8,625,000)
Percentage Of Total Available For Sale Securities	100.00%	100.00%
Equity Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	$ 214,267,000	$ 217,046,000
Available For Sale Securities Gross Unrealized Gain	8,235,000	6,958,000
Available For Sale Securities Gross Unrealized Losses	1,837,000	1,304,000
Available For Sale Securities Fair Value Disclosure	$ 220,665,000	$ 222,700,000
Percentage Of Total Available For Sale Securities	100.00%	100.00%
Corporate Debt Securities Member \| Fixed Maturities Member
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	$ 11,464,082,000	$ 11,333,431,000
Available For Sale Securities Gross Unrealized Gain	1,022,512,000	1,085,973,000
Available For Sale Securities Gross Unrealized Losses	45,093,000	39,333,000
Available For Sale Securities Fair Value Disclosure	12,441,501,000	12,380,071,000
Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Availableforsale Debt Securities	$ 0	$ 0
Percentage Of Total Available For Sale Securities	55.50%	55.50%
Canadian Provincial Governments [Member] \| Fixed Maturities Member
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	$ 2,681,603,000	$ 2,676,777,000
Available For Sale Securities Gross Unrealized Gain	1,261,728,000	1,372,731,000
Available For Sale Securities Gross Unrealized Losses	1,133,000	174,000
Available For Sale Securities Fair Value Disclosure	3,942,198,000	4,049,334,000
Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Availableforsale Debt Securities	$ 0	$ 0
Percentage Of Total Available For Sale Securities	17.60%	18.20%
Residential Mortgage Backed Securities Member \| Fixed Maturities Member
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	$ 1,005,232,000	$ 969,267,000
Available For Sale Securities Gross Unrealized Gain	75,579,000	76,520,000
Available For Sale Securities Gross Unrealized Losses	4,041,000	3,723,000
Available For Sale Securities Fair Value Disclosure	1,076,770,000	1,042,064,000
Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Availableforsale Debt Securities	$ (241,000)	$ (241,000)
Percentage Of Total Available For Sale Securities	4.80%	4.70%
Asset Backed Securities Member \| Fixed Maturities Member
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	$ 752,280,000	$ 700,455,000
Available For Sale Securities Gross Unrealized Gain	23,333,000	19,898,000
Available For Sale Securities Gross Unrealized Losses	19,069,000	28,798,000
Available For Sale Securities Fair Value Disclosure	756,544,000	691,555,000
Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Availableforsale Debt Securities	$ (2,259,000)	$ (2,259,000)
Percentage Of Total Available For Sale Securities	3.40%	3.10%
Commercial Mortgage Backed Securities Member \| Fixed Maturities Member
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	$ 1,596,659,000	$ 1,608,376,000
Available For Sale Securities Gross Unrealized Gain	143,381,000	142,369,000
Available For Sale Securities Gross Unrealized Losses	41,896,000	51,842,000
Available For Sale Securities Fair Value Disclosure	1,698,144,000	1,698,903,000
Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Availableforsale Debt Securities	$ (5,431,000)	$ (6,125,000)
Percentage Of Total Available For Sale Securities	7.60%	7.60%
US Government And Government Agencies And Authorities Member \| Fixed Maturities Member
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	$ 299,395,000	$ 231,256,000
Available For Sale Securities Gross Unrealized Gain	31,938,000	33,958,000
Available For Sale Securities Gross Unrealized Losses	132,000	24,000
Available For Sale Securities Fair Value Disclosure	331,201,000	265,190,000
Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Availableforsale Debt Securities	$ 0	$ 0
Percentage Of Total Available For Sale Securities	1.50%	1.20%
US States And Political Subdivisions Member \| Fixed Maturities Member
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	$ 281,215,000	$ 270,086,000
Available For Sale Securities Gross Unrealized Gain	37,628,000	38,058,000
Available For Sale Securities Gross Unrealized Losses	5,746,000	5,646,000
Available For Sale Securities Fair Value Disclosure	313,097,000	302,498,000
Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Availableforsale Debt Securities	$ 0	$ 0
Percentage Of Total Available For Sale Securities	1.40%	1.40%
Other Foreign Government, Supranational And Foreign Government-Sponsored Enterprises \| Fixed Maturities Member
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	$ 1,758,483,000	$ 1,769,784,000
Available For Sale Securities Gross Unrealized Gain	87,306,000	94,929,000
Available For Sale Securities Gross Unrealized Losses	3,585,000	2,714,000
Available For Sale Securities Fair Value Disclosure	1,842,204,000	1,861,999,000
Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Availableforsale Debt Securities	$ 0	$ 0
Percentage Of Total Available For Sale Securities	8.20%	0.00%
Nonredeemable Preferred Stock Member \| Equity Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	$ 76,179,000	$ 68,469,000
Available For Sale Securities Gross Unrealized Gain	7,940,000	6,542,000
Available For Sale Securities Gross Unrealized Losses	8,000	170,000
Available For Sale Securities Fair Value Disclosure	$ 84,111,000	$ 74,841,000
Percentage Of Total Available For Sale Securities	38.10%	33.60%
Equity Securities Other Member \| Equity Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	$ 138,088,000	$ 148,577,000
Available For Sale Securities Gross Unrealized Gain	295,000	416,000
Available For Sale Securities Gross Unrealized Losses	1,829,000	1,134,000
Available For Sale Securities Fair Value Disclosure	$ 136,554,000	$ 147,859,000
Percentage Of Total Available For Sale Securities	61.90%	66.40%

Retrocession Arrangements and Reinsurance Ceded Receivables

3 Months Ended

Mar. 31, 2013

Retrocession Arrangements And Reinsurance Ceded Receivables [Abstract]

Retrocession And Claims Recoverable [Text Block]

11. Retrocession Arrangements and Reinsurance Ceded Receivables

The Company generally reports retrocession activity on a gross basis. Amounts paid or deemed to have been paid for reinsurance are reflected in reinsurance ceded receivables. The cost of reinsurance related to long-duration contracts is recognized over the terms of the reinsured policies on a basis consistent with the reporting of those policies. In the normal course of business, the Company seeks to limit its exposure to loss on any single insured and to recover a portion of benefits paid by ceding reinsurance to other insurance enterprises or reinsurers under excess coverage, quota share and coinsurance contracts.

Certain retrocessions are arranged through the Company's retrocession pools for amounts in excess of the Company's retention limit. As of March 31, 2013 and December 31, 2012, all rated retrocession pool participants rated by the A.M. Best Company were rated “A- (excellent)” or better, except for one pool member that was rated “B++.” The Company verifies retrocession pool participants' ratings on a quarterly basis. For a majority of the retrocessionaires that were not rated, security in the form of letters of credit or trust assets has been given as additional security in favor of RGA Reinsurance Company (“RGA Reinsurance”). In addition, the Company performs annual financial reviews of its retrocessionaires to evaluate financial stability and performance.

As of March 31, 2013 and December 31, 2012, the Company had claims recoverable from retrocessionaires of $156.4 million and $156.0 million, respectively, which is included in reinsurance ceded receivables, in the condensed consolidated balance sheets. The Company considers outstanding claims recoverable in excess of 90 days to be past due. There were $16.6 million and $10.4 million of past due claims recoverable as of March 31, 2013 and December 31, 2012, respectively. Based on financial reviews of the counterparties, the Company has not established a valuation allowance for claims recoverable. The Company has never experienced a material default in connection with retrocession arrangements, nor has it experienced any difficulty in collecting claims recoverable from retrocessionaires; however, no assurance can be given as to the future performance of such retrocessionaires or as to recoverability of any such claims.

Segment Information (Tables)

3 Months Ended

Mar. 31, 2013

Segment Information [Abstract]

Reconciliation Of Revenue From Segments To Consolidated Text Block

	Three months ended March 31,
Total revenues:	2013		2012
U.S.	$	1,500,264	$	1,324,147
Canada		297,089		275,623
Europe & South Africa		339,229		308,337
Asia Pacific		388,969		359,685
Corporate and Other		75,551		25,183
Total	$	2,601,102	$	2,292,975

Reconciliation Of Operating Profit Loss From Segments To Consolidated Text Block

	Three months ended March 31,
Income (loss) before income taxes:	2013		2012
U.S.	$	174,409	$	92,745
Canada		36,308		55,063
Europe & South Africa		17,385		6,606
Asia Pacific		14,518		32,067
Corporate and Other		36,207		(5,718)
Total	$	278,827	$	180,763

Reconciliation Of Assets From Segment To Consolidated Text Block


Total Assets:	March 31, 2013		December 31, 2012
U.S.	$	24,802,143	$	24,924,363
Canada		3,946,500		3,764,002
Europe & South Africa		2,137,397		2,235,199
Asia Pacific		3,051,842		3,208,732
Corporate and Other		6,259,219		6,228,142
Total	$	40,197,101	$	40,360,438

Equity Based Compensation

3 Months Ended

Mar. 31, 2013

Equity Based Compensation [Abstract]

Equity Based Compensation

10. Equity Based Compensation

Equity compensation expense was $9.7 million and $8.4 million in the first quarter of 2013 and 2012, respectively. In the first quarter of 2013, the Company granted 0.7 million stock appreciation rights at $58.77 weighted average exercise price per share and 0.3 million performance contingent units to employees. Additionally, non-employee directors were granted a total of 14,200 shares of common stock. As of March 31, 2013, 2.1 million share options at $49.29 weighted average per share were vested and exercisable with a remaining weighted average exercise period of 5.1 years. As of March 31, 2013, the total compensation cost of non-vested awards not yet recognized in the financial statements was $44.6 million. It is estimated that these costs will vest over a weighted average period of 3.1 years.

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 64, 65, A240
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 93-6
-Paragraph 53
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 50
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929

+ Details

Comprehensive Income (Tables)

3 Months Ended

Mar. 31, 2013

Comprehensive Income [Abstract]

Components Of Accumulated Other Comprehensive Income [Text Block]

		Accumulated Other Comprehensive Income (Loss), Net of Income Tax
			Accumulated		Unrealized
			Currency		Appreciation		Pension and
			Translation		(Depreciation)		Postretirement
			Adjustments		of Investments⁽¹⁾		Benefits		Total
Balance, December 31, 2012		$	267,475	$	1,877,657	$	(36,230)	$	2,108,902
	Other comprehensive income (loss) before reclassifications		(14,105)		(112,711)		99		(126,717)
	Amounts reclassified from AOCI		--		(6,171)		726		(5,445)
Net current-period other comprehensive income (loss)			(14,105)		(118,882)		825		(132,162)
Balance, March 31, 2013		$	253,370	$	1,758,775	$	(35,405)	$	1,976,740

			Accumulated Other Comprehensive Income (Loss), Net of Income Tax
				Accumulated		Unrealized
				Currency		Appreciation		Pension and
				Translation		(Depreciation)		Postretirement
				Adjustments		of Investments⁽¹⁾		Benefits		Total
Balance, December 31, 2011			$	229,795	$	1,419,318	$	(30,960)	$	1,618,153
	Change in component during the period			24,080		(30,721)		290		(6,351)
Balance, March 31, 2012			$	253,875	$	1,388,597	$	(30,670)	$	1,611,802

(1)		Includes cash flow hedges. See Note 5 - "Derivative Instruments" for additional information on cash flow hedges.

Reclassification Out Of Accumulated Other Comprehensive Income [Table Text Block]

			Amount
			Reclassified
Details about AOCI Components			from AOCI	Affected Line Item in Statement of Income
Unrealized gains and losses on available-for-sale securities		$	10,348	Investment related gains (losses), net
Gains and losses on cash flow hedge - interest rate swap			305	Investment income
Deferred policy acquisition costs attributed to unrealized gains and losses⁽¹⁾			(1,548)
			9,105	Total before tax
			(2,934)	Tax expense
		$	6,171	Net of tax

Amortization of unrealized pension and postretirement benefits:
	Prior service cost⁽²⁾	$	(94)
	Actuarial gains/(losses)⁽²⁾		(1,023)
			(1,117)	Total before tax
			391	Tax benefit
		$	(726)	Net of tax

Total reclassifications for the period		$	5,445	Net of tax

(1)	This AOCI component is included in the computation of the deferred policy acquisition cost. See Note 8 – “Deferred policy Acquisition Costs” of the 2012 Annual Report for additional details.
(2)	These AOCI components are included in the computation of the net periodic pension cost. See Note 9 – “Employee Benefit Plans” for additional details.

CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($)	3 Months Ended
CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($)	Mar. 31, 2013	Mar. 31, 2012
Revenues:
Net premiums	$ 1,979,693,000	$ 1,863,482,000
Investment income, net of related expenses	425,131,000	340,940,000
Investment related gains (losses), net:
Other-than-temporary impairments on fixed maturity securities	(202,000)	(7,607,000)
Other-than-temporary impairments on fixed maturity securities transferred to (from) accumulated other comprehensive income	0	(7,221,000)
Other investment related gains (losses), net	94,573,000	58,348,000
Total investment related gains (losses), net	94,371,000	43,520,000
Other revenues	101,907,000	45,033,000
Total revenues	2,601,102,000	2,292,975,000
Benefits and Expenses:
Claims and other policy benefits	1,688,910,000	1,580,149,000
Interest credited	125,483,000	88,042,000
Policy Acquisition Costs And Other Insurance Expenses	357,357,000	307,634,000
Other operating expenses	119,501,000	110,098,000
Interest expense	28,486,000	23,322,000
Collateral Financing Expense	2,538,000	2,967,000
Total benefits and expenses	2,322,275,000	2,112,212,000
Income before income taxes	278,827,000	180,763,000
Provision for income taxes	(93,292,000)	(57,445,000)
Net income	$ 185,535,000	$ 123,318,000
Earnings Per Share [Abstract]
Basic earning per share	$ 2.51	$ 1.68
Diluted earnings per share	2.49	1.67
Dividends declared per share	$ 0.24	$ 0.18

Derivative Instruments (Details 2) - Interest Rate Swap Member - USD ($)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Derivatives In Cash Flow Hedging Relationships [Line Items]
Gains Losses Deferred In Accumulated Other Comprehensive Income Loss On Derivatives Effective Portion	$ 1,863,000	$ 323,000
Investment Related Gains Losses [Member]
Derivatives In Cash Flow Hedging Relationships [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	0	0
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	(17,000)	(24,000)
Investment Income [Member]
Derivatives In Cash Flow Hedging Relationships [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	305,000	357,000
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	$ 0	$ 0

Commitments and Contingent Liabilities (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Credit Facility 850 Million [Member]
Line Of Credit Facility [Line Items]
Credit Facility Maturity Date	December 2015
Credit Facility Basis Of Fees	Senior unsecured long-term debt rating
Credit Facility Amount Utilized	$ 140,000	$ 402,900
Credit Facility 200 Million [Member]
Line Of Credit Facility [Line Items]
Credit Facility Maturity Date	September 2019
Credit Facility Basis Of Fees	Fixed
Credit Facility Amount Utilized	$ 200,000	200,000
Credit Facility 120 Million [Member]
Line Of Credit Facility [Line Items]
Credit Facility Maturity Date	May 2016
Credit Facility Basis Of Fees	Fixed
Credit Facility Amount Utilized	$ 100,000	100,000
Credit Facility 270 Million [Member]
Line Of Credit Facility [Line Items]
Credit Facility Maturity Date	November 2017
Credit Facility Basis Of Fees	Fixed
Credit Facility Amount Utilized	$ 270,000	$ 0

Fair Value Disclosures (Details 5) - USD ($)	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Assets
Fixed maturity securities	$ 22,401,659,000	$ 22,291,614,000
Mortgage loans on real estate	2,325,191,000	2,300,587,000
Policy loans	1,245,812,000	1,278,175,000
Funds withheld at interest	5,698,594,000	5,594,182,000
Short-term investments	180,707,000	288,082,000
Other invested assets	1,129,651,000	1,159,543,000
Cash and cash equivalents	1,001,841,000	1,259,892,000	$ 873,933,000	$ 962,870,000
Accrued Investment Income	230,269,000	201,344,000
Reinsurance ceded receivables	602,373,000	620,901,000
Liabilities
Interest-sensitive contract liabilities	13,141,402,000	13,353,502,000
Collateral finance facility	491,987,000	652,010,000
Fair Value Inputs Level 1 Member
Assets
Fixed maturity securities	598,605,000	533,349,000
Mortgage loans on real estate	0	0
Policy loans		0
Funds withheld at interest		0
Short-term investments		48,951,000
Other invested assets		0
Cash and cash equivalents		684,028,000
Accrued Investment Income		0
Liabilities
Interest-sensitive contract liabilities		0
Long And Short Term Debt		0
Collateral finance facility		0
Fair Value Inputs Level 2 Member
Assets
Fixed maturity securities	19,481,405,000	19,520,344,000
Mortgage loans on real estate	0	0
Policy loans		1,278,175,000
Funds withheld at interest		0
Short-term investments		0
Other invested assets		32,250,000
Cash and cash equivalents		0
Accrued Investment Income		201,344,000
Liabilities
Interest-sensitive contract liabilities		0
Long And Short Term Debt		0
Collateral finance facility		0
Fair Value Inputs Level 3 Member
Assets
Fixed maturity securities	2,321,649,000	2,237,921,000
Mortgage loans on real estate	2,429,358,000	2,426,688,000
Policy loans		0
Funds withheld at interest		6,362,324,000
Short-term investments		0
Other invested assets		594,108,000
Cash and cash equivalents		0
Accrued Investment Income		0
Liabilities
Interest-sensitive contract liabilities		11,926,339,000
Long And Short Term Debt		2,014,062,000
Collateral finance facility		456,050,000
Carrying Value [Member]
Assets
Mortgage loans on real estate	2,325,191,000	2,300,587,000
Policy loans	1,245,812,000	1,278,175,000
Funds withheld at interest	5,851,967,000	5,837,359,000
Short-term investments	23,426,000	48,951,000
Other invested assets	552,420,000	596,336,000
Cash and cash equivalents	633,965,000	684,028,000
Accrued Investment Income	230,269,000	201,344,000
Liabilities
Interest-sensitive contract liabilities	11,385,069,000	11,566,962,000
Long And Short Term Debt	1,815,392,000	1,815,253,000
Collateral finance facility	491,987,000	652,010,000
Estimated Fair Value [Member]
Assets
Mortgage loans on real estate	2,429,358,000	2,426,688,000
Policy loans	1,245,812,000	1,278,175,000
Funds withheld at interest	6,363,220,000	6,362,324,000
Short-term investments	23,426,000	48,951,000
Other invested assets	589,979,000	626,358,000
Cash and cash equivalents	633,965,000	684,028,000
Accrued Investment Income	230,269,000	201,344,000
Liabilities
Interest-sensitive contract liabilities	11,805,623,000	11,926,339,000
Long And Short Term Debt	2,025,511,000	2,014,062,000
Collateral finance facility	368,625,000	$ 456,050,000
Estimated Fair Value [Member] \| Fair Value Inputs Level 1 Member
Assets
Policy loans	0
Funds withheld at interest	0
Short-term investments	23,426,000
Other invested assets	0
Cash and cash equivalents	633,965,000
Accrued Investment Income	0
Liabilities
Interest-sensitive contract liabilities	0
Long And Short Term Debt	0
Collateral finance facility	0
Estimated Fair Value [Member] \| Fair Value Inputs Level 2 Member
Assets
Policy loans	1,245,812,000
Funds withheld at interest	0
Short-term investments	0
Other invested assets	32,250,000
Cash and cash equivalents	0
Accrued Investment Income	230,269,000
Liabilities
Interest-sensitive contract liabilities	0
Long And Short Term Debt	0
Collateral finance facility	0
Estimated Fair Value [Member] \| Fair Value Inputs Level 3 Member
Assets
Policy loans	0
Funds withheld at interest	6,363,220,000
Short-term investments	0
Other invested assets	557,729,000
Cash and cash equivalents	0
Accrued Investment Income	0
Liabilities
Interest-sensitive contract liabilities	11,805,623,000
Long And Short Term Debt	2,025,511,000
Collateral finance facility	$ 368,625,000

Financing Activities

3 Months Ended

Mar. 31, 2013

Financing Activities And Stock Transactions [Abstract]

Stockholders' Equity Note Disclosure [Text Block]

13. Stock Transactions

On January 24, 2013, RGA's board of directors authorized a share repurchase program for up to $200.0 million of RGA's outstanding common stock. This authorization was effective January 24, 2013 and does not have an expiration date. During the first quarter of 2013, RGA repurchased 815,011 shares of common stock under this program for $47.6 million. During April 2013, the Company repurchased an additional 892,047 shares of common stock under the program for $52.4 million. The common shares repurchased have been placed into treasury to be used for general corporate purposes.

On April 18, 2013, RGA's board of directors authorized an increase of $100.0 million to the share repurchase program previously authorized on January 24, 2013. With this authorization, the total amount of the Company's outstanding common stock authorized for repurchase is $300.0 million.

- Definition

The entire disclosure for shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, if any, including other comprehensive income (as applicable). Including, but not limited to: (1) balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings; (2) accumulated balance for each classification of other comprehensive income and total amount of comprehensive income; (3) amount and nature of changes in separate accounts, including the number of shares authorized and outstanding, number of shares issued upon exercise and conversion, and for other comprehensive income, the adjustments for reclassifications to net income; (4) rights and privileges of each class of stock authorized; (5) basis of treasury stock, if other than cost, and amounts paid and accounting treatment for treasury stock purchased significantly in excess of market; (6) dividends paid or payable per share and in the aggregate for each class of stock for each period presented; (7) dividend restrictions and accumulated preferred dividends in arrears (in aggregate and per share amount); (8) retained earnings appropriations or restrictions, such as dividend restrictions; (9) impact of change in accounting principle, initial adoption of new accounting principle and correction of an error in previously issued financial statements; (10) shares held in trust for Employee Stock Ownership Plan (ESOP); (11) deferred compensation related to issuance of capital stock; (12) note received for issuance of stock; (13) unamortized discount on shares; (14) description, terms, and number of warrants or rights outstanding; (15) shares under subscription and subscription receivables, effective date of new retained earnings after quasi-reorganization and deficit eliminated by quasi-reorganization and, for a period of at least ten years after the effective date, the point in time from which the new retained dates; and (16) retroactive effective of subsequent change in capital structure.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 4
-Section 08
-Paragraph d

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Chapter 1
-Section B
-Paragraph 7, 11A
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 2, 3, 4, 5, 6, 7, 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Article 4

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30, 31
-Article 5

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section E

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section C

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644

Reference 17: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(d),(e))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 18: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644

Reference 19: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656

Reference 20: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 4.E)
-URI http://asc.fasb.org/extlink&oid=6228006&loc=d3e74512-122707

Reference 21: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Preferred Stock
-URI http://asc.fasb.org/extlink&oid=6521494

Reference 22: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29-31)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 23: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB TOPIC 4.C)
-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187143-122770

+ Details

Derivative Instruments (Details 4) - USD ($)	3 Months Ended
Derivative Instruments (Details 4) - USD ($)	Mar. 31, 2013	Mar. 31, 2012
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	$ 94,371,000	$ 43,520,000
Policy Acquisition Costs And Other Insurance Expenses	357,357,000	307,634,000
Interest credited	125,483,000	88,042,000
Interest Rate Swap Member
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	(22,265,000)	(47,352,000)
Future Member
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	(6,881,000)	(17,409,000)
Foreign Exchange Forward Member
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	(5,659,000)	(1,608,000)
Consumer Price Index Swap [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	(871,000)	(802,000)
Credit Default Swap Member
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	3,904,000	11,813,000
Equity Member
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	(30,623,000)	(37,983,000)
Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	90,257,000	(9,428,000)
Embedded Derivatives In Indexed Annuity [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Policy Acquisition Costs And Other Insurance Expenses	0	(998,000)
Interest credited	(32,996,000)	(18,741,000)
Embedded Derivatives In Variable Annuity [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	51,314,000	146,375,000
Interest Rate Options [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	$ 1,982,000	$ 0

Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2013

Employee Benefit Plans [Abstract]

Schedule Of Defined Benefit Plans Disclosures Text Block

	Pension Benefits				Other Benefits
	Three months ended March 31,				Three months ended March 31,
	2013		2012		2013		2012
Net periodic benefit cost:
Service cost	$	1,883	$	1,532	$	410	$	279
Interest Cost		1,018		980		312		259
Expected return on plan assets		(767)		(734)		--		--
Amortization of prior service cost		94		99		--		--
Amortization of prior actuarial loss		837		275		186		88
Total	$	3,065	$	2,152	$	908	$	626

- Definition

Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5, 6, 7
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 4, 7, 16, 20, 21
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=6930749&loc=d3e4179-114921

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e2410-114920

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e2439-114920

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e2417-114920

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Comprehensive Income

3 Months Ended

Mar. 31, 2013

Comprehensive Income [Abstract]

Comprehensive Income

3. Accumulated Other Comprehensive Income

The balance of and changes in each component of accumulated other comprehensive income (loss) (“AOCI”) for the three months ended March 31, 2013 and 2012 are as follows (dollars in thousands):

		Accumulated Other Comprehensive Income (Loss), Net of Income Tax
			Accumulated		Unrealized
			Currency		Appreciation		Pension and
			Translation		(Depreciation)		Postretirement
			Adjustments		of Investments⁽¹⁾		Benefits		Total
Balance, December 31, 2012		$	267,475	$	1,877,657	$	(36,230)	$	2,108,902
	Other comprehensive income (loss) before reclassifications		(14,105)		(112,711)		99		(126,717)
	Amounts reclassified from AOCI		--		(6,171)		726		(5,445)
Net current-period other comprehensive income (loss)			(14,105)		(118,882)		825		(132,162)
Balance, March 31, 2013		$	253,370	$	1,758,775	$	(35,405)	$	1,976,740

			Accumulated Other Comprehensive Income (Loss), Net of Income Tax
				Accumulated		Unrealized
				Currency		Appreciation		Pension and
				Translation		(Depreciation)		Postretirement
				Adjustments		of Investments⁽¹⁾		Benefits		Total
Balance, December 31, 2011			$	229,795	$	1,419,318	$	(30,960)	$	1,618,153
	Change in component during the period			24,080		(30,721)		290		(6,351)
Balance, March 31, 2012			$	253,875	$	1,388,597	$	(30,670)	$	1,611,802

(1)		Includes cash flow hedges. See Note 5 - "Derivative Instruments" for additional information on cash flow hedges.

The following table presents the amounts reclassified out of AOCI for the three months ended March 31, 2013 (dollars in thousands):

			Amount
			Reclassified
Details about AOCI Components			from AOCI	Affected Line Item in Statement of Income
Unrealized gains and losses on available-for-sale securities		$	10,348	Investment related gains (losses), net
Gains and losses on cash flow hedge - interest rate swap			305	Investment income
Deferred policy acquisition costs attributed to unrealized gains and losses⁽¹⁾			(1,548)
			9,105	Total before tax
			(2,934)	Tax expense
		$	6,171	Net of tax

Amortization of unrealized pension and postretirement benefits:
	Prior service cost⁽²⁾	$	(94)
	Actuarial gains/(losses)⁽²⁾		(1,023)
			(1,117)	Total before tax
			391	Tax benefit
		$	(726)	Net of tax

Total reclassifications for the period		$	5,445	Net of tax

(1)	This AOCI component is included in the computation of the deferred policy acquisition cost. See Note 8 – “Deferred policy Acquisition Costs” of the 2012 Annual Report for additional details.
(2)	These AOCI components are included in the computation of the net periodic pension cost. See Note 9 – “Employee Benefit Plans” for additional details.

- Definition

The entire disclosure for comprehensive income. Includes, but is not limited to, the following: 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. Components of comprehensive income include: (1) foreign currency translation adjustments; (2) gains (losses) on foreign currency transactions that are designated as, and are effective as, economic hedges of a net investment in a foreign entity; (3) gains (losses) on intercompany foreign currency transactions that are of a long-term-investment nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements; (4) change in the market value of a futures contract that qualifies as a hedge of an asset reported at fair value; (5) unrealized holding gains (losses) on available-for-sale securities and that resulting from transfers of debt securities from the held-to-maturity category to the available-for-sale category; (6) a net loss recognized as an additional pension liability not yet recognized as net periodic pension cost; and (7) the net gain (loss) and net prior service cost or credit for pension plans and other postretirement benefit plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 14-26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e637-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e681-108580

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e653-108580

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e709-108580

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6920433&loc=d3e998-108581

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e640-108580

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Reclassification Adjustments
-URI http://asc.fasb.org/extlink&oid=6522872

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e716-108580

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e689-108580

+ Details

Derivative Instruments

3 Months Ended

Mar. 31, 2013

Derivative Instruments [Abstract]

Derivative Instruments

5. Derivative Instruments

Derivatives, except embedded derivatives, are carried on the Company's condensed consolidated balance sheets in other invested assets or other liabilities, at fair value. Embedded derivative liabilities on modified coinsurance or funds withheld arrangements are included on the condensed consolidated balance sheets with the host contract in funds withheld at interest, at fair value. Embedded derivative liabilities on indexed annuity and variable annuity products are included on the condensed consolidated balance sheets with the host contract in interest-sensitive contract liabilities, at fair value. Embedded derivative assets are included on the condensed consolidated balance sheets in reinsurance ceded receivables. The following table presents the notional amounts and fair value of derivative instruments as of March 31, 2013 and December 31, 2012 (dollars in thousands):

				March 31, 2013						December 31, 2012
					Notional	Carrying Value/Fair Value					Notional	Carrying Value/Fair Value
					Amount		Assets		Liabilities		Amount		Assets		Liabilities
Derivatives not designated as
	hedging instruments:
	Interest rate swaps			$	1,566,403	$	99,860	$	15,642	$	2,195,059	$	123,085	$	17,867
	Interest rate options				240,000		16,054		--		--		--		--
	Financial futures				113,046		--		--		127,877		--		--
	Foreign currency forwards				70,000		--		7,014		74,400		1,017		2,105
	Consumer price index swaps				85,332		945		--		85,135		1,446		--
	Credit default swaps				716,700		2,160		5,431		714,000		2,228		5,922
	Equity options				812,494		54,791		--		696,776		62,514		--
	Synthetic guaranteed investment contracts				3,185,035		--		--		2,018,073		--		--
	Embedded derivatives in:
		Modified coinsurance or funds
			withheld arrangements		--		--		156,189		--		--		243,177
		Indexed annuity products			--		--		769,685		--		--		740,256
		Variable annuity products			--		--		120,791		--		--		172,105
	Total non-hedging derivatives				6,789,010		173,810		1,074,752		5,911,320		190,290		1,181,432

Derivatives designated as
	hedging instruments:
	Interest rate swaps				55,098		254		2,273		57,275		344		786
	Foreign currency swaps				632,921		1,172		11,719		629,512		--		27,398
	Total hedging derivatives				688,019		1,426		13,992		686,787		344		28,184
Total derivatives				$	7,477,029	$	175,236	$	1,088,744	$	6,598,107	$	190,634	$	1,209,616

Accounting for Derivative Instruments and Hedging Activities

The Company does not enter into derivative instruments for speculative purposes. As discussed below under “Non-qualifying Derivatives and Derivatives for Purposes Other Than Hedging,” the Company uses various derivative instruments for risk management purposes that either do not qualify or have not been qualified for hedge accounting treatment, including derivatives used to economically hedge changes in the fair value of liabilities associated with the reinsurance of variable annuities with guaranteed living benefits. As of March 31, 2013 and December 31, 2012, the Company held interest rate swaps that were designated and qualified as cash flow hedges of interest rate risk. As of March 31, 2013 and December 31, 2012, the Company held foreign currency swaps that were designated and qualified as hedges of a portion of its net investment in its foreign operations. As of March 31, 2013 and December 31, 2012, the Company also had derivative instruments that were not designated as hedging instruments. See Note 2 – “Summary of Significant Accounting Policies” of the Company's 2012 Annual Report for a detailed discussion of the accounting treatment for derivative instruments, including embedded derivatives. Derivative instruments are carried at fair value and generally require an insignificant amount of cash at inception of the contracts.

Cash Flow Hedges

The Company designates and accounts for certain interest rate swaps, in which the cash flows are denominated in different currencies, commonly referred to as cross-currency swaps, as cash flow hedges when they meet the requirements of the general accounting principles for Derivatives and Hedging.

The following table presents the components of AOCI, before income tax, and the condensed consolidated income statement classification where the gain or loss is recognized related to cash flow hedges for the three months ended March 31, 2013 and 2012 (dollars in thousands):

	Three months ended March 31,
	2013		2012
Accumulated other comprehensive income (loss), balance beginning of period	$	403	$	(828)
Gains (losses) deferred in other comprehensive income (loss) on the effective portion of cash flow hedges		1,863		323
Amounts reclassified to investment income		(305)		(357)
Accumulated other comprehensive income (loss), balance end of period	$	1,961	$	(862)

As of March 31, 2013, the before-tax deferred net gains on derivative instruments recorded in AOCI that are expected to be reclassified to earnings during the next twelve months are $0.8 million. This expectation is based on the anticipated interest payments on hedged investments in fixed maturity securities that will occur over the next twelve months, at which time the Company will recognize the deferred net gains (losses) as an adjustment to investment income over the term of the investment cash flows. There were no hedged forecasted transactions, other than the receipt or payment of variable interest payments on existing financial instruments, for the three months ended March 31, 2013 and 2012.

The following table presents the effects of derivatives in cash flow hedging relationships on the condensed consolidated statements of income and AOCI for the three months ended March 31, 2013 and 2012 (dollars in thousands):

Derivatives in Cash Flow Hedging Relationships	Amount of Gains (Losses) Deferred in AOCI on Derivatives		Amount and Location of Gains (Losses) Reclassified from AOCI into Income (Loss)				Amount and Location of Gains (Losses) Recognized in Income (Loss) on Derivatives
	(Effective Portion)		(Effective Portion)				(Ineffective Portion and Amounts Excluded from Effectiveness Testing)
			Investment Related Gains (Losses)		Investment Income		Investment Related Gains (Losses)		Investment Income
For the three months ended March 31, 2013:
Interest rate swaps	$	1,863	$	--	$	305	$	(17)	$	--

For the three months ended March 31, 2012:
Interest rate swaps	$	323	$	--	$	357	$	(24)	$	--

Hedges of Net Investments in Foreign Operations

The Company uses foreign currency swaps to hedge a portion of its net investment in certain foreign operations against adverse movements in exchange rates. The following table illustrates the Company's net investments in foreign operations (“NIFO”) hedges for the three months ended March 31, 2013 and 2012 (dollars in thousands):

		Derivative Gains (Losses) Deferred in AOCI
		For the three months ended March 31,
Type of NIFO Hedge ^{(1) (2)}		2013		2012

Foreign currency swaps		$	10,922	$	(10,645)

(1)	There were no sales or substantial liquidations of net investments in foreign operations that would have required the reclassification of gains or losses from accumulated other comprehensive income (loss) into investment income during the periods presented.
(2)	There was no ineffectiveness recognized for the Company's hedges of net investments in foreign operations.

The cumulative foreign currency translation loss recorded in AOCI related to these hedges was $5.5 million and $16.4 million at March 31, 2013 and December 31, 2012, respectively. If a foreign operation was sold or substantially liquidated, the amounts in AOCI would be reclassified to the condensed consolidated statements of income. A pro rata portion would be reclassified upon partial sale of a foreign operation.

Non-qualifying Derivatives and Derivatives for Purposes Other Than Hedging

The Company uses various derivative instruments for risk management purposes that either do not qualify or have not been qualified for hedge accounting treatment, including derivatives used to economically hedge changes in the fair value of liabilities associated with the reinsurance of variable annuities with guaranteed living benefits. The gain or loss related to the change in fair value for these derivative instruments is recognized in investment related gains (losses), in the condensed consolidated statements of income, except where otherwise noted. For the three months ended March 31, 2013 and 2012, the Company recognized investment related losses of $60.4 million and $93.3 million, respectively, related to derivatives (not including embedded derivatives) that do not qualify or have not been qualified for hedge accounting.

A summary of the effect of non-hedging derivatives, including embedded derivatives, on the Company’s income statement for the three months ended March 31, 2013 and 2012 is as follows (dollars in thousands):

				Gain (Loss) for the Three Months Ended
				March 31,
Type of Non-hedging Derivative		Income Statement Location of Gain (Loss)		2013		2012
Interest rate swaps		Investment related gains (losses), net		$	(22,265)	$	(47,352)
Interest rate options		Investment related gains (losses), net			1,982		--
Financial futures		Investment related gains (losses), net			(6,881)		(17,409)
Foreign currency forwards		Investment related gains (losses), net			(5,659)		(1,608)
CPI swaps		Investment related gains (losses), net			(871)		(802)
Credit default swaps		Investment related gains (losses), net			3,904		11,813
Equity options		Investment related gains (losses), net			(30,623)		(37,983)
Embedded derivatives in:
	Modco or funds withheld arrangements	Investment related gains (losses), net			90,257		(9,428)
	Indexed annuity products	Policy acquisition costs and other insurance
			expenses		--		(998)
	Indexed annuity products	Interest credited			(32,996)		(18,741)
	Variable annuity products	Investment related gains (losses), net			51,314		146,375
Total non-hedging derivatives				$	48,162	$	23,867

Types of Derivatives Used by the Company

Interest Rate Swaps

Interest rate swaps are used by the Company primarily to reduce market risks from changes in interest rates and to alter interest rate exposure arising from mismatches between assets and liabilities (duration mismatches). With an interest rate swap, the Company agrees with another party to exchange, at specified intervals, the difference between two rates, which can be either fixed-rate or floating-rate interest amounts, tied to an agreed-upon notional principal amount. These transactions are executed pursuant to master agreements that provide for a single net payment or individual gross payments at each due date.

Interest Rate Options

Interest rate options, commonly referred to as swaptions, are used by the Company primarily to hedge living benefit guarantees embedded in certain variable annuity products. A swaption, used to hedge against adverse changes in interest rates, is an option to enter into a swap with a forward starting effective date. The Company pays an upfront premium for the right to exercise this option in the future.

Financial Futures

Exchange-traded equity futures are used primarily to economically hedge liabilities embedded in certain variable annuity products. With exchange-traded equity futures transactions, the Company agrees to purchase or sell a specified number of contracts, the value of which is determined by the relevant stock indices, and to post variation margin on a daily basis in an amount equal to the difference between the daily estimated fair values of those contracts. The Company enters into exchange-traded equity futures with regulated futures commission merchants that are members of the exchange.

Equity Options

Equity index options are used by the Company primarily to hedge minimum guarantees embedded in certain variable annuity products. To hedge against adverse changes in equity indices volatility, the Company buys put options. The contracts are net settled in cash based on differentials in the indices at the time of exercise and the strike price.

Consumer Price Index Swaps

Consumer price index (“CPI”) swaps are used by the Company primarily to economically hedge liabilities embedded in certain insurance products where value is directly affected by changes in a designated benchmark consumer price index. With a CPI swap transaction, the Company agrees with another party to exchange the actual amount of inflation realized over a specified period of time for a fixed amount of inflation determined at inception. These transactions are executed pursuant to master agreements that provide for a single net payment or individual gross payments to be made by the counterparty at each due date. Most of these swaps will require a single payment to be made by one counterparty at the maturity date of the swap.

Foreign Currency Swaps

Foreign currency swaps are used by the Company to reduce the risk from fluctuations in foreign currency exchange rates associated with its assets and liabilities denominated in foreign currencies. With a foreign currency swap transaction, the Company agrees with another party to exchange, at specified intervals, the difference between one currency and another at a forward exchange rate calculated by reference to an agreed upon principal amount. The principal amount of each currency is exchanged at the termination of the currency swap by each party.

Foreign Currency Forwards

Foreign currency forwards are used by the Company to reduce the risk from fluctuations in foreign currency exchange rates associated with its assets and liabilities denominated in foreign currencies. With a foreign currency forward transaction, the Company agrees with another party to deliver a specified amount of an identified currency at a specified future date. The price is agreed upon at the time of the contract and payment for such a contract is made in a different currency at the specified future date.

Credit Default Swaps

The Company sells protection under single name credit default swaps and credit default swap index tranches to diversify its credit risk exposure in certain portfolios and, in combination with purchasing securities, to replicate characteristics of similar investments based on the credit quality and term of the credit default swap. Credit default triggers for indexed reference entities and single name reference entities are defined in the contracts. The Company's maximum exposure to credit loss equals the notional value for credit default swaps. In the event of default for credit default swaps, the Company is typically required to pay the protection holder the full notional value less a recovery rate determined at auction.

The following table presents the estimated fair value, maximum amount of future payments and weighted average years to maturity of credit default swaps sold by the Company at March 31, 2013 and December 31, 2012 (dollars in thousands):

		March 31, 2013						December 31, 2012
Rating Agency Designation of Referenced Credit Obligations⁽¹⁾		Estimated Fair Value of Credit Default Swaps		Maximum Amount of Future Payments under Credit Default Swaps⁽²⁾		Weighted Average Years to Maturity⁽³⁾	Estimated Fair Value of Credit Default Swaps		Maximum Amount of Future Payments under Credit Default Swaps⁽²⁾		Weighted Average Years to Maturity⁽³⁾
AAA/AA-/A+/A/A-
Single name credit default swaps		$	(1,630)	$	124,500	5.7	$	(2,077)	$	124,500	5.9
Credit default swaps referencing indices			--		--	--		--		--	--
	Subtotal		(1,630)		124,500	5.7		(2,077)		124,500	5.9

BBB+/BBB/BBB-
Single name credit default swaps			(2,030)		138,200	5.7		(2,345)		135,500	5.5
Credit default swaps referencing indices			565		430,000	4.7		937		430,000	5.0
	Subtotal		(1,465)		568,200	5.0		(1,408)		565,500	5.1

BB+
Single name credit default swaps			(110)		6,000	4.2		(222)		6,000	4.5
Credit default swaps referencing indices			--		--	--		--		--	--
	Subtotal		(110)		6,000	4.2		(222)		6,000	4.5

Total		$	(3,205)	$	698,700	5.1	$	(3,707)	$	696,000	5.2

(1)	The rating agency designations are based on ratings from Standard and Poor's ("S&P").
(2)	Assumes the value of the referenced credit obligations is zero.
(3)	The weighted average years to maturity of the credit default swaps is calculated based on weighted average notional amounts.

The Company also purchases credit default swaps to reduce its risk against a drop in bond prices due to credit concerns of certain bond issuers. If a credit event, as defined by the contract, occurs, the Company is able to put the bond back to the counterparty at par.

Synthetic Guaranteed Investment Contracts

The Company sells fee-based synthetic guaranteed investment contracts which include investment-only, stable value contracts, to retirement plans. The assets are owned by the trustees of such plans, who invest the assets under the terms of investment guidelines agreed to with the Company. The contracts contain a guarantee of a minimum rate of return on participant balances supported by the underlying assets, and a guarantee of liquidity to meet certain participant-initiated plan cash flow requirements. These contracts are accounted for as derivatives, recorded at fair value and classified as interest rate derivatives.

Embedded Derivatives

The Company has certain embedded derivatives which are required to be separated from their host contracts and reported as derivatives. Host contracts include reinsurance treaties structured on a modified coinsurance (“modco”) or funds withheld basis. Changes in fair values of embedded derivatives on modco or funds withheld treaties are net of a decrease in investment related gains (losses), net of $1.7 million and $63.5 million for the three months ended March 31, 2013 and 2012, respectively, associated with the Company's own credit risk. Changes in fair values of embedded derivatives on variable annuity contracts are net of a decrease in investment related gains (losses), net of $11.9 million and $37.0 million for the three months ended March 31, 2013 and 2012, respectively, associated with the Company's own credit risk. Additionally, the Company reinsures equity-indexed annuity and variable annuity contracts with benefits that are considered embedded derivatives, including guaranteed minimum withdrawal benefits, guaranteed minimum accumulation benefits, and guaranteed minimum income benefits. The related gains (losses) and the effect on net income after amortization of deferred acquisition costs (“DAC”) and income taxes for the three months ended March 31, 2013 and 2012 are reflected in the following table (dollars in thousands):

		Three months ended
		March 31,
		2013		2012
Embedded derivatives in modco or funds withheld arrangements included
	in investment related gains	$	90,257	$	(9,428)
After the associated amortization of DAC and taxes, the related amounts included in net income			21,624		1,933

Embedded derivatives in variable annuity contracts included in investment related gains			51,314		146,375
After the associated amortization of DAC and taxes, the related amounts included in net income			12,192		15,082
Amounts related to embedded derivatives in equity-indexed annuities included
	in benefits and expenses		(32,996)		(19,739)
After the associated amortization of DAC and taxes, the related amounts included in net income			(29,550)		13,870

Credit Risk

The Company manages its credit risk related to over-the-counter derivatives by entering into transactions with creditworthy counterparties, maintaining collateral arrangements and through the use of master agreements that provide for a single net payment to be made by one counterparty to another at each due date and upon termination. As exchange-traded futures are affected through regulated exchanges, and positions are marked to market on a daily basis, the Company has minimal exposure to credit-related losses in the event of nonperformance by counterparties.

The Company enters into various collateral arrangements, which require both the posting and accepting of collateral in connection with its derivative instruments. Collateral agreements contain attachment thresholds that may vary depending on the posting party's ratings. Additionally, a decline in the Company's or the counterparty's credit ratings to specified levels could result in potential settlement of the derivative positions under the Company's agreements with its counterparties. The Company also has exchange-traded futures, which require the maintenance of a margin account.

The Company's credit exposure related to derivative contracts is generally limited to the fair value at the reporting date plus or minus any collateral posted or held by the Company. Information regarding the Company's credit exposure related to its over-the-counter derivative contracts and margin account for exchange-traded futures at March 31, 2013 and December 31, 2012 are reflected in the following table (dollars in thousands):

			March 31, 2013		December 31, 2012
Estimated fair value of derivatives in net asset position			$	133,157	$	136,558
	Cash provided as collateral⁽¹⁾			6,250		27,867
	Securities pledged to counterparties as collateral⁽²⁾			14,118		1,565
	Cash pledged from counterparties as collateral⁽³⁾			(126,329)		(136,414)
	Securities pledged from counterparties as collateral⁽⁴⁾			(17,664)		(22,458)
Net credit exposure			$	9,532	$	7,118

Margin account related to exchange-traded futures⁽⁵⁾			$	3,529	$	5,605

(1)		Consists of receivable from counterparty, included in other assets.
(2)		Included in other invested assets, primarily consists of U.S. Treasury securities.
(3)		Included in cash and cash equivalents, with obligation to return cash collateral recorded in other liabilities.
(4)		Consists of U.S. Treasury securities.
(5)		Included in cash and cash equivalents.

- Definition

The entire disclosure for the entity's entire derivative instruments and hedging activities. Describes an entity's risk management strategies, derivatives in hedging activities and non-hedging derivative instruments, the assets, obligations, liabilities, revenues and expenses arising therefrom, and the amounts of and methodologies and assumptions used in determining the amounts of such items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 45
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6887037&loc=d3e80784-113994

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5579245-113959

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6935481&loc=d3e41638-113959

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5580258-113959

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5579240-113959

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6935481&loc=d3e41641-113959

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6935481&loc=d3e41620-113959

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4E
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624181-113959

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5618551-113959

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4D
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624177-113959

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6887037&loc=d3e80748-113994

Reference 17: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4H
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624258-113959

Reference 18: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4K
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5708775-113959

Reference 19: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6935481&loc=d3e41635-113959

Reference 20: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(n))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 21: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4J
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5708773-113959

Reference 22: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6441202&loc=d3e80720-113993

+ Details

Derivative Instruments (Details 3) - USD ($)	3 Months Ended
Derivative Instruments (Details 3) - USD ($)	Mar. 31, 2013	Mar. 31, 2012
Currency Swap Member
Net Investments in Foreign Operations [Line Items]
Net Derivatives Gains (Losses) Deferred in AOCI	$ 10,922,000	$ (10,645,000)

Investments (Details 12) - USD ($)	Mar. 31, 2013	Dec. 31, 2012
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]
Loans Receivable Commercial Real Estate	$ 2,335,115,000	$ 2,312,167,000
Pacific [Member]
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]
Loans Receivable Commercial Real Estate	$ 597,540,000	$ 593,589,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	25.60%	25.70%
South Atlantic [Member]
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]
Loans Receivable Commercial Real Estate	$ 483,398,000	$ 477,068,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	20.70%	20.50%
Mountain [Member]
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]
Loans Receivable Commercial Real Estate	$ 251,406,000	$ 233,174,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	10.80%	10.10%
Middle Atlantic [Member]
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]
Loans Receivable Commercial Real Estate	$ 286,314,000	$ 300,475,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	12.30%	13.00%
West North Central [Member]
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]
Loans Receivable Commercial Real Estate	$ 160,203,000	$ 168,063,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	6.80%	7.30%
East North Central [Member]
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]
Loans Receivable Commercial Real Estate	$ 243,202,000	$ 224,122,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	10.40%	9.70%
West South Central [Member]
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]
Loans Receivable Commercial Real Estate	$ 160,117,000	$ 161,451,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	6.90%	7.00%
East South Central [Member]
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]
Loans Receivable Commercial Real Estate	$ 62,323,000	$ 62,789,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	2.70%	2.70%
New England [Member]
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]
Loans Receivable Commercial Real Estate	$ 90,612,000	$ 91,436,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	3.80%	4.00%

Earnings Per Share (Details) - USD ($)	3 Months Ended
Earnings Per Share (Details) - USD ($)	Mar. 31, 2013	Mar. 31, 2012
Earnings:
Net income (numerator for basic and diluted calculations)	$ 185,535,000	$ 123,318,000
Shares:
Weighted average outstanding shares (denominator for basic calculation)	73,838,000	73,575,000
Equivalent shares from outstanding stock options	551,000	468,000
Denominator for diluted calculation	74,389,000	74,043,000
Earnings Per Share:
Basic earning per share	$ 2.51	$ 1.68
Diluted earnings per share	$ 2.49	$ 1.67

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 36, 37, 38
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 5
-Section 03
-Paragraph 20

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 7
-Paragraph 18

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 21
-Article 9

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.21)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1252-109256

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 55
-Paragraph 52
-URI http://asc.fasb.org/extlink&oid=6945512&loc=d3e4984-109258

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.23)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.19)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References + Details

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1448-109256

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Weighted-Average Number of Common Shares Outstanding
-URI http://asc.fasb.org/extlink&oid=6528421

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Derivative Instruments (Details 1) - USD ($)	3 Months Ended
Derivative Instruments (Details 1) - USD ($)	Mar. 31, 2013	Mar. 31, 2012
AOCI Cash Flow Hedges [Roll Forward]
Balance beginning	$ 403,000	$ (828,000)
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss)	1,863,000	323,000
Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	0	0
Cash Flow Hedge Gain (Loss) Reclassified to Investment Income, Net	(305,000)	(357,000)
Balance ending	$ 1,961,000	$ (862,000)

Commitments and Contingent Liabilities (Tables)

3 Months Ended

Mar. 31, 2013

Commitments And Contingent Liabilities [Abstract]

Credit Facilities [Table Text Block]

			Amount Utilized⁽¹⁾
	Facility Capacity	Maturity Date	March 31, 2013		December 31, 2012		Basis of Fees
	$850.0	December 2015	$	140.0	$	402.9	Senior unsecured long-term debt rating
	$200.0	September 2019		200.0		200.0	Fixed
	$120.0	May 2016		100.0		100.0	Fixed
	$270.0	November 2017		270.0		--	Fixed

(1)	Represents issued but undrawn letters of credit. There was no cash borrowed for the periods presented.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash Flows from Operating Activities:
Net income	$ 185,535,000	$ 123,318,000
Change in operating assets and liabilities:
Accrued investment income	(30,083,000)	(28,616,000)
Premiums receivable and other reinsurance balances	72,864,000	(61,722,000)
Deferred policy acquisition costs	42,741,000	(65,583,000)
Reinsurance ceded balances	28,131,000	28,686,000
Future policy benefits, other policy claims and benefits, and other reinsurance balances	275,091,000	554,354,000
Total deferred income taxes	16,343,000	38,107,000
Other assets and other liabilities, net	(12,317,000)	5,944,000
Amortization of net investment premiums, discounts and other	(22,497,000)	(35,281,000)
Investment related gains, net	(94,371,000)	(43,520,000)
Gains Losses On Extinguishment Of Collateral Finance Securities	(46,506,000)	0
Excess tax benefits from share-based payment arrangement	(143,000)	30,000
Other, net	80,142,000	38,938,000
Net cash provided by operating activities	494,930,000	554,655,000
Cash Flows from Investing Activities:
Sales of fixed maturity securities available-for-sale	795,575,000	47,096,000
Maturities of fixed maturity securities available-for-sale	36,028,000	36,437,000
Purchases of fixed maturity securities available-for-sale	(1,277,240,000)	(572,345,000)
Cash invested in mortgage loans	(79,361,000)	(75,081,000)
Cash invested in policy loans	0	0
Cash invested in funds withheld at interest	(29,829,000)	(33,083,000)
Principal payments on mortgage loans on real estate	52,157,000	22,081,000
Principal payments on policy loans	32,378,000	330,000
Change in short-term investments and other invested assets	84,917,000	65,256,000
Net cash used in investing activities	(385,375,000)	(509,309,000)
Cash Flows from Financing Activities:
Dividends to stockholders	(17,753,000)	(13,255,000)
Repurchase of long-term debt	(112,000,000)	0
Purchases of treasury stock	(47,640,000)	(4,118,000)
Excess tax benefits from share-based payment arrangement	143,000	(30,000)
Exercise of stock options, net	1,071,000	216,000
Change in cash collateral for derivative positions	11,532,000	(100,565,000)
Deposits on universal life and other investment type policies and contracts	17,241,000	37,303,000
Withdrawals on universal life and other investment type policies and contracts	204,196,000	59,922,000
Net cash used in financing activities	(351,602,000)	(140,371,000)
Effect of exchange rate changes on cash	(16,004,000)	6,088,000
Change in cash and cash equivalents	(258,051,000)	(88,937,000)
Cash and cash equivalents, beginning of period	1,259,892,000	962,870,000
Cash and cash equivalents, end of period	1,001,841,000	873,933,000
Supplementary information:
Cash paid for interest	16,552,000	24,592,000
Cash paid for income taxes, net of refunds	$ 9,125,000	$ 15,112,000

Investments (Details 7) - USD ($)	Mar. 31, 2013	Dec. 31, 2012
Gross unrealized losses with number of securities [Line Items]
Available For Sale Securities Gross Unrealized Losses	$ 122,532,000	$ 133,558,000
Percentage Of Total Gross Unrealized Losses For Fixed Maturity And Equity Securities	100.00%	100.00%
Less Than 20 Percent [Member]
Gross unrealized losses with number of securities [Line Items]
Available For Sale Securities Gross Unrealized Losses	$ 66,235,000	$ 54,951,000
Percentage Of Total Gross Unrealized Losses For Fixed Maturity And Equity Securities	54.10%	41.20%
More Than Or Equal To 20 Percent For Less Than Six Months [Member]
Gross unrealized losses with number of securities [Line Items]
Available For Sale Securities Gross Unrealized Losses	$ 0	$ 734,000
Percentage Of Total Gross Unrealized Losses For Fixed Maturity And Equity Securities	0.00%	0.50%
More Than Or Equal To 20 Percent For Six Months Or Greater [Member]
Gross unrealized losses with number of securities [Line Items]
Available For Sale Securities Gross Unrealized Losses	$ 56,297,000	$ 77,873,000
Percentage Of Total Gross Unrealized Losses For Fixed Maturity And Equity Securities	45.90%	58.30%

Comprehensive Income (Details 1) - USD ($)	3 Months Ended
Comprehensive Income (Details 1) - USD ($)	Mar. 31, 2013	Mar. 31, 2012
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Other investment related gains (losses), net	$ 94,573,000	$ 58,348,000
Investment income, net of related expenses	425,131,000	340,940,000
Provision for income taxes	93,292,000	57,445,000
Net income	185,535,000	$ 123,318,000
Unrealized Appreciation Depreciation Of Investments [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	9,105,000
Provision for income taxes	(2,934,000)
Net income	6,171,000
Unrealized Appreciation Depreciation Of Investments [Member] \| Unrealized Gains Losses On Available For Sale Securities [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Other investment related gains (losses), net	10,348,000
Unrealized Appreciation Depreciation Of Investments [Member] \| Gains Losses On Qualifying Cash Flow Hedging Instruments [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Investment income, net of related expenses	305,000
Unrealized Appreciation Depreciation Of Investments [Member] \| DAC Attributed To Unrealized Gains Losses [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
DeferredPolicyAcquisitionCostAmortizationExpenseUnrealizedInvestmentGainsLosses	(1,548,000)
Amortization Of Unrealized Pension And Postretirement Benefits [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(1,117,000)
Provision for income taxes	391,000
Net income	(726,000)
Amortization Of Unrealized Pension And Postretirement Benefits [Member] \| Prior Service Cost [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanNetPriorServiceCostCreditRecognizedInNetPeriodicBenefitCostBeforeTax	(94,000)
OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostBeforeTax	(1,023,000)
Amounts Reclassified From AOCI [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net income	$ 5,445,000

Investments (Details 9) - USD ($)	3 Months Ended
Investments (Details 9) - USD ($)	Mar. 31, 2013	Mar. 31, 2012
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment Revenue	$ 437,391,000	$ 350,490,000
Investment Income Investment Expense	12,260,000	9,550,000
Investment income, net of related expenses	425,131,000	340,940,000
Availableforsale Securities Member
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment Revenue	239,244,000	191,418,000
Mortgage Loans On Real Estate Member
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment Revenue	28,243,000	14,965,000
Policy Loans Member
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment Revenue	17,910,000	16,783,000
Funds Withheld At Interest [Member]
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment Revenue	137,259,000	115,014,000
Short Term Investments Member
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment Revenue	813,000	988,000
Other Aggregated Investments Member
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment Revenue	$ 13,922,000	$ 11,322,000

Equity Based Compensation (Narrative Details)	3 Months Ended
Equity Based Compensation (Narrative Details)	Mar. 31, 2013 USD ($) $ / shares shares	Mar. 31, 2012 USD ($)
Equity Based Compensation [Abstract]
Allocated Share Based Compensation Expense \| $	$ 9,700,000	$ 8,400,000
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross	700,000
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price \| $ / shares	$ 58.77
Performance Contingent Units	300,000
Shares Granted To Non Employee Directors	14,200
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number	2,100,000
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price \| $ / shares	$ 49.29
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Remaining Contractual Term	5.1
Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized \| $	$ 44,600,000
Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition	3.1

Derivative Instruments (Narrative Details) - USD ($)	3 Months Ended	12 Months Ended
Derivative Instruments (Narrative Details) - USD ($)	Mar. 31, 2013	Dec. 31, 2012
Derivative Instruments [Abstract]
Cumulative Foreign Currency Translation Gain Loss Recorded In Accumulated Other Comprehensive Income Loss For Terminated Net Investment In Foreign Operations Hedges	$ 5,500,000	$ 16,400,000
Gain Loss On Investments Related To Change In Fair Value Of Derivatives Excluding Embedded Derivatives	60,400,000	93,300,000
Maximum Potential Future Exposure on Credit Risk Derivatives	698,700,000	696,000,000
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	800,000
Embedded Derivative Gain Loss In Financial Statements From Use Of Own Credit Risk	1,700,000	63,500,000
Embedded Derivative Gain Loss On Variable Annuity Contracts In Financial Statements From Use Of Own Credit Risk	$ 11,900,000	$ 37,000,000

Investments (Details 3) - USD ($)	3 Months Ended
Investments (Details 3) - USD ($)	Mar. 31, 2013	Mar. 31, 2012
Other Than Temporary Impairment Credit Losses Recognized In Earnings Roll Forward
Balance, beginning of period	$ 16,675,000	$ 63,947,000
Initial impairments - credit loss OTTI recognized on securities not previously impaired	0	1,902,000
Additional impairments - credit loss OTTI recognized on securities previously impaired	0	8,720,000
Other Than Temporary Impairments Credit Losses On Securities Impaired To Fair Value	0	(11,381,000)
Credit loss impairments previously recognized on securities which were sold during the period	(1,902,000)	(952,000)
Balance, end of period	$ 14,773,000	$ 62,236,000

Investments (Details 17) - USD ($)	3 Months Ended
Investments (Details 17) - USD ($)	Mar. 31, 2013	Mar. 31, 2012
Allowance For Loan And Lease Losses Roll Forward
Balance, Beginning of Period	$ 11,580,000	$ 11,793,000
Charge-offs	(852,000)	(2,193,000)
Recoveries	0	0
Provision (release)	(804,000)	5,050,000
Balance, End of Period	$ 9,924,000	$ 14,650,000

Derivative Instruments (Details 5) - USD ($)	Mar. 31, 2013	Dec. 31, 2012
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	$ (3,205,000)	$ (3,707,000)
Maximum Potential Future Exposure on Credit Risk Derivatives	$ 698,700,000	$ 696,000,000
Derivative Average Remaining Maturity	5.1	5.2
Standard Poors AAA To A Minus Ratings [Member] \| Single Name Credit Default Swaps [Member]
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	$ (1,630,000)	$ (2,077,000)
Maximum Potential Future Exposure on Credit Risk Derivatives	$ 124,500,000	$ 124,500,000
Derivative Average Remaining Maturity	5.7	5.9
Standard Poors AAA To A Minus Ratings [Member] \| Credit Default Swaps Referencing Indices [Member]
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	$ 0	$ 0
Maximum Potential Future Exposure on Credit Risk Derivatives	$ 0	$ 0
Derivative Average Remaining Maturity	--	--
Standard Poors AAA To A Minus Ratings [Member] \| Credit Default Subtotal [Member]
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	$ (1,630,000)	$ (2,077,000)
Maximum Potential Future Exposure on Credit Risk Derivatives	$ 124,500,000	$ 124,500,000
Derivative Average Remaining Maturity	5.7	5.9
StandardPoorsBBBRatingMember \| Single Name Credit Default Swaps [Member]
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	$ (2,030,000)	$ (2,345,000)
Maximum Potential Future Exposure on Credit Risk Derivatives	$ 138,200,000	$ 135,500,000
Derivative Average Remaining Maturity	5.7	5.5
StandardPoorsBBBRatingMember \| Credit Default Swaps Referencing Indices [Member]
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	$ 565,000	$ 937,000
Maximum Potential Future Exposure on Credit Risk Derivatives	$ 430,000,000	$ 430,000,000
Derivative Average Remaining Maturity	4.7	5.0
StandardPoorsBBBRatingMember \| Credit Default Subtotal [Member]
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	$ (1,465,000)	$ (1,408,000)
Maximum Potential Future Exposure on Credit Risk Derivatives	$ 568,200,000	$ 565,500,000
Derivative Average Remaining Maturity	5.0	5.1
StandardPoorsBBRatingMember \| Single Name Credit Default Swaps [Member]
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	$ (110,000)	$ (222,000)
Maximum Potential Future Exposure on Credit Risk Derivatives	$ 6,000,000	$ 6,000,000
Derivative Average Remaining Maturity	4.2	4.5
StandardPoorsBBRatingMember \| Credit Default Swaps Referencing Indices [Member]
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	$ 0	$ 0
Maximum Potential Future Exposure on Credit Risk Derivatives	$ 0	$ 0
Derivative Average Remaining Maturity	--	--
StandardPoorsBBRatingMember \| Credit Default Subtotal [Member]
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	$ (110,000)	$ (222,000)
Maximum Potential Future Exposure on Credit Risk Derivatives	$ 6,000,000	$ 6,000,000
Derivative Average Remaining Maturity	4.2	4.5

Investments

3 Months Ended

Mar. 31, 2013

Mar. 31, 2012

Investments Abstract

Investments

4. Investments

Fixed Maturity and Equity Securities Available-for-Sale

The following tables provide information relating to investments in fixed maturity and equity securities by sector as of March 31, 2013 and December 31, 2012 (dollars in thousands):

													Other-than-
									Estimated				temporary
March 31, 2013:			Amortized		Unrealized		Unrealized		Fair		% of		impairments
			Cost		Gains		Losses		Value		Total		in AOCI
Available-for-sale:
	Corporate securities		$	11,464,082	$	1,022,512	$	45,093	$	12,441,501	55.5	%	$	--
	Canadian and Canadian provincial
		governments		2,681,603		1,261,728		1,133		3,942,198	17.6			--
	Residential mortgage-backed securities			1,005,232		75,579		4,041		1,076,770	4.8			(241)
	Asset-backed securities			752,280		23,333		19,069		756,544	3.4			(2,259)
	Commercial mortgage-backed securities			1,596,659		143,381		41,896		1,698,144	7.6			(5,431)
	U.S. government and agencies			299,395		31,938		132		331,201	1.5			--
	State and political subdivisions			281,215		37,628		5,746		313,097	1.4			--
	Other foreign government, supranational and
		foreign government-sponsored enterprises		1,758,483		87,306		3,585		1,842,204	8.2			--
		Total fixed maturity securities	$	19,838,949	$	2,683,405	$	120,695	$	22,401,659	100.0	%	$	(7,931)

Non-redeemable preferred stock			$	76,179	$	7,940	$	8	$	84,111	38.1	%
Other equity securities				138,088		295		1,829		136,554	61.9
		Total equity securities	$	214,267	$	8,235	$	1,837	$	220,665	100.0	%

													Other-than-
									Estimated				temporary
December 31, 2012:			Amortized		Unrealized		Unrealized		Fair		% of		impairments
			Cost		Gains		Losses		Value		Total		in AOCI
Available-for-sale:
	Corporate securities		$	11,333,431	$	1,085,973	$	39,333	$	12,380,071	55.5	%	$	--
	Canadian and Canadian provincial
		governments		2,676,777		1,372,731		174		4,049,334	18.2			--
	Residential mortgage-backed securities			969,267		76,520		3,723		1,042,064	4.7			(241)
	Asset-backed securities			700,455		19,898		28,798		691,555	3.1			(2,259)
	Commercial mortgage-backed securities			1,608,376		142,369		51,842		1,698,903	7.6			(6,125)
	U.S. government and agencies			231,256		33,958		24		265,190	1.2			--
	State and political subdivisions			270,086		38,058		5,646		302,498	1.4			--
	Other foreign government, supranational and
		foreign government-sponsored enterprises		1,769,784		94,929		2,714		1,861,999	8.3			--
		Total fixed maturity securities	$	19,559,432	$	2,864,436	$	132,254	$	22,291,614	100.0	%	$	(8,625)

Non-redeemable preferred stock			$	68,469	$	6,542	$	170	$	74,841	33.6	%
Other equity securities				148,577		416		1,134		147,859	66.4
		Total equity securities	$	217,046	$	6,958	$	1,304	$	222,700	100.0	%

The Company enters into various collateral arrangements that require both the pledging and acceptance of fixed maturity securities as collateral. The Company pledged fixed maturity securities as collateral to derivative and reinsurance counterparties with an amortized cost of $25.4 million and $16.9 million, and an estimated fair value of $25.8 million and $17.0 million, as of March 31, 2013 and December 31, 2012 respectively, which are included in other invested assets in the condensed consolidated balance sheets. Securities with an amortized cost of $8,216.3 million and $7,549.0 million, and an estimated fair value of $8,889.9 million and $7,913.8 million, as of March 31, 2013 and December 31, 2012, respectively, were held in trust to satisfy collateral requirements under certain third-party reinsurance treaties.

The Company received fixed maturity securities as collateral from derivative and reinsurance counterparties with an estimated fair value of $85.4 million and $95.6 million, as of March 31, 2013 and December 31, 2012, respectively. The collateral is held in separate custodial accounts and is not recorded on the Company's condensed consolidated balance sheets. Subject to certain constraints, the Company is permitted by contract to sell or re-pledge this collateral; however, as of March 31, 2013 and December 31, 2012, none of the collateral had been sold or re-pledged.

As of March 31, 2013, the Company held securities with a fair value of $1,357.9 million that were guaranteed or issued by the Canadian province of Ontario and $1,723.9 million that were guaranteed or issued by the Canadian province of Quebec, both of which exceeded 10% of total stockholders' equity. As of December 31, 2012, the Company held securities with a fair value of $1,400.0 million that were guaranteed or issued by the Canadian province of Ontario and $1,785.0 million that were guaranteed or issued by the Canadian province of Quebec, both of which exceeded 10% of total stockholders' equity.

The amortized cost and estimated fair value of fixed maturity securities available-for-sale at March 31, 2013 are shown by contractual maturity in the table below. Actual maturities can differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Asset and mortgage-backed securities are shown separately in the table below, as they are not due at a single maturity date. At March 31, 2013, the contractual maturities of investments in fixed maturity securities were as follows (dollars in thousands):

			Amortized		Fair
			Cost		Value
Available-for-sale:
	Due in one year or less		$	348,130	$	352,916
	Due after one year through five years			3,716,625		3,917,468
	Due after five years through ten years			6,922,683		7,521,433
	Due after ten years			5,497,340		7,078,384
	Asset and mortgage-backed securities			3,354,171		3,531,458
		Total	$	19,838,949	$	22,401,659

The tables below show the major industry types of the Company's corporate fixed maturity holdings as of March 31, 2013 and December 31, 2012 (dollars in thousands):

March 31, 2013:					Estimated
			Amortized Cost		Fair Value	% of Total
Finance		$	3,693,500	$	3,978,979	32.0	%
Industrial			5,977,146		6,480,028	52.1
Utility			1,763,573		1,951,839	15.7
Other			29,863		30,655	0.2
	Total	$	11,464,082	$	12,441,501	100.0	%

December 31, 2012:					Estimated
			Amortized Cost		Fair Value	% of Total
Finance		$	3,619,455	$	3,900,152	31.5	%
Industrial			5,881,967		6,443,846	52.0
Utility			1,799,658		2,002,611	16.2
Other			32,351		33,462	0.3
	Total	$	11,333,431	$	12,380,071	100.0	%

Other-Than-Temporary Impairments

As discussed in Note 2 – “Summary of Significant Accounting Policies” of the 2012 Annual Report, a portion of certain other-than-temporary impairment ("OTTI") losses on fixed maturity securities are recognized in AOCI. For these securities the net amount recognized in earnings ("credit loss impairments") represents the difference between the amortized cost of the security and the net present value of its projected future cash flows discounted at the effective interest rate implicit in the debt security prior to impairment. Any remaining difference between the fair value and amortized cost is recognized in AOCI. The following table sets forth the amount of pre-tax credit loss impairments on fixed maturity securities held by the Company as of the dates indicated, for which a portion of the OTTI loss was recognized in AOCI, and the corresponding changes in such amounts (dollars in thousands):

	Three months ended March 31,
	2013		2012
Balance, beginning of period	$	16,675	$	63,947
Initial impairments - credit loss OTTI recognized on securities not previously impaired		--		1,902
Additional impairments - credit loss OTTI recognized on securities previously impaired		--		8,720
Credit loss OTTI previously recognized on securities impaired to fair value during the period		--		(11,381)
Credit loss OTTI previously recognized on securities which matured, paid down, prepaid or were sold during the period		(1,902)		(952)
Balance, end of period	$	14,773	$	62,236

Purchased Credit Impaired Fixed Maturity Securities Available-for-Sale

In the third quarter of 2012, the Company began purchasing certain residential mortgage-backed securities that had experienced deterioration in credit quality since their issuance. Securities acquired with evidence of credit quality deterioration since origination and for which it is probable at the acquisition date that the Company will be unable to collect all contractually required payments are classified as purchased credit impaired securities. For each security, the excess of the cash flows expected to be collected as of the acquisition date over its acquisition date fair value is referred to as the accretable yield and is recognized as net investment income on an effective yield basis. At the date of acquisition, the timing and amount of the cash flows expected to be collected was determined based on a best estimate using key assumptions, such as interest rates, default rates and prepayment speeds. If subsequently, based on current information and events, it is probable that there is a significant increase in cash flows previously expected to be collected or if actual cash flows are significantly greater than cash flows previously expected to be collected, the accretable yield is adjusted prospectively. The excess of the contractually required payments (including interest) as of the acquisition date over the cash flows expected to be collected as of the acquisition date is referred to as the nonaccretable difference, and this amount is not expected to be realized as net investment income. Decreases in cash flows expected to be collected can result in OTTI.

The following tables present information on the Company's purchased credit impaired securities, which are included in fixed maturity securities available-for-sale (dollars in thousands):

		March 31, 2013		December 31, 2012
Outstanding principal and interest balance⁽¹⁾		$	172,800	$	108,831
Carrying value, including accrued interest⁽²⁾		$	134,564	$	84,765

(1)	Represents the contractually required payments which is the sum of contractual principal, whether or not currently due, and accrued interest.
(2)	Estimated fair value plus accrued interest.

The following table presents information about purchased credit impaired investments acquired during the three months ended March 31, 2013 (dollars in thousands).

		At Date of
		Acquisition
Contractually required payments (including interest)		$	91,863
Cash flows expected to be collected⁽¹⁾		$	72,940
Fair value of investments acquired		$	50,874

(1)	Represents undiscounted principal and interest cash flow expectations at the date of acquisition.

The following table presents activity for the accretable yield on purchased credit impaired securities for the three months ended March 31, 2013 (dollars in thousands):

	Three months ended
	March 31, 2013
Balance, beginning of period	$	39,239
Investments purchased		22,066
Accretion		(1,943)
Reclassification to nonaccretable difference		553
Balance, end of period	$	59,915

Unrealized Losses for Fixed Maturity and Equity Securities Available-for-Sale

The following table presents the total gross unrealized losses for the 667 and 567 fixed maturity and equity securities as of March 31, 2013 and December 31, 2012, respectively, where the estimated fair value had declined and remained below amortized cost by the indicated amount (dollars in thousands):

		March 31, 2013				December 31, 2012
		Gross				Gross
		Unrealized				Unrealized
		Losses		% of Total		Losses		% of Total
Less than 20%		$	66,235	54.1	%	$	54,951	41.2	%
20% or more for less than six months			--	--			734	0.5
20% or more for six months or greater			56,297	45.9			77,873	58.3
	Total	$	122,532	100.0	%	$	133,558	100.0	%

The Company's determination of whether a decline in value is other-than-temporary includes analysis of the underlying credit and the extent and duration of a decline in value. The Company's credit analysis of an investment includes determining whether the issuer is current on its contractual payments, evaluating whether it is probable that the Company will be able to collect all amounts due according to the contractual terms of the security and analyzing the overall ability of the Company to recover the amortized cost of the investment. The Company continues to consider declines in value as a potential indicator of credit deterioration. However, the Company believes that due to fluctuating market conditions and an extended period of economic uncertainty, the extent and duration of a decline in value have become less indicative of when there has been credit deterioration with respect to a fixed maturity security since it may not have an impact on the ability of the issuer to service all scheduled payments and the Company's evaluation of the recoverability of all contractual cash flows or the ability to recover an amount at least equal to amortized cost. In the Company's impairment review process, the duration and severity of an unrealized loss position for equity securities are given greater weight and consideration given the lack of contractual cash flows or deferability features.

The following tables present the estimated fair values and gross unrealized losses, including other-than-temporary impairment losses reported in AOCI, for 667 and 567 fixed maturity and equity securities that have estimated fair values below amortized cost as of March 31, 2013 and December 31, 2012, respectively (dollars in thousands). These investments are presented by class and grade of security, as well as the length of time the related market value has remained below amortized cost.

			Less than 12 months				12 months or greater				Total
					Gross				Gross				Gross
March 31, 2013:			Estimated		Unrealized		Estimated		Unrealized		Estimated		Unrealized
			Fair Value		Losses		Fair Value		Losses		Fair Value		Losses
Investment grade securities:
	Corporate securities		$	1,187,238	$	25,066	$	89,284	$	11,614	$	1,276,522	$	36,680
	Canadian and Canadian provincial
		governments		59,042		1,133		--		--		59,042		1,133
	Residential mortgage-backed securities			54,738		469		17,664		2,920		72,402		3,389
	Asset-backed securities			91,530		672		86,661		7,216		178,191		7,888
	Commercial mortgage-backed securities			79,509		471		21,920		6,521		101,429		6,992
	U.S. government and agencies			56,975		132		--		--		56,975		132
	State and political subdivisions			30,734		266		11,463		5,480		42,197		5,746
	Other foreign government, supranational and
		foreign government-sponsored enterprises		335,216		2,809		7,375		744		342,591		3,553
		Total investment grade securities		1,894,982		31,018		234,367		34,495		2,129,349		65,513

Non-investment grade securities:
	Corporate securities			155,261		2,961		30,763		5,452		186,024		8,413
	Residential mortgage-backed securities			18,215		298		4,681		354		22,896		652
	Asset-backed securities			10,138		171		29,370		11,010		39,508		11,181
	Commercial mortgage-backed securities			--		--		66,674		34,904		66,674		34,904
	Other foreign government, supranational and
		foreign government-sponsored enterprises		1,034		32		--		--		1,034		32
		Total non-investment grade securities		184,648		3,462		131,488		51,720		316,136		55,182
		Total fixed maturity securities	$	2,079,630	$	34,480	$	365,855	$	86,215	$	2,445,485	$	120,695

	Non-redeemable preferred stock		$	7,885	$	7	$	1	$	1	$	7,886	$	8
	Other equity securities			110,187		1,829		--		--		110,187		1,829
		Total equity securities	$	118,072	$	1,836	$	1	$	1	$	118,073	$	1,837

			Less than 12 months				12 months or greater				Total
					Gross				Gross				Gross
December 31, 2012:			Estimated		Unrealized		Estimated		Unrealized		Estimated		Unrealized
			Fair Value		Losses		Fair Value		Losses		Fair Value		Losses
Investment grade securities:
	Corporate securities		$	786,203	$	13,276	$	108,187	$	17,386	$	894,390	$	30,662
	Canadian and Canadian provincial
		governments		12,349		174		--		--		12,349		174
	Residential mortgage-backed securities			22,288		97		19,394		3,199		41,682		3,296
	Asset-backed securities			59,119		449		96,179		9,508		155,298		9,957
	Commercial mortgage-backed securities			89,507		797		29,181		7,974		118,688		8,771
	U.S. government and agencies			7,272		24		--		--		7,272		24
	State and political subdivisions			20,602		1,514		11,736		4,132		32,338		5,646
	Other foreign government, supranational and
		foreign government-sponsored enterprises		244,817		1,953		7,435		761		252,252		2,714
		Total investment grade securities		1,242,157		18,284		272,112		42,960		1,514,269		61,244

Non-investment grade securities:
	Corporate securities			181,168		3,170		39,123		5,501		220,291		8,671
	Residential mortgage-backed securities			15,199		80		2,633		347		17,832		427
	Asset-backed securities			3,421		26		31,938		18,815		35,359		18,841
	Commercial mortgage-backed securities			3,317		764		68,405		42,307		71,722		43,071
		Total non-investment grade securities		203,105		4,040		142,099		66,970		345,204		71,010
		Total fixed maturity securities	$	1,445,262	$	22,324	$	414,211	$	109,930	$	1,859,473	$	132,254

	Non-redeemable preferred stock		$	5,577	$	52	$	5,679	$	118	$	11,256	$	170
	Other equity securities			85,374		1,134		--		--		85,374		1,134
		Total equity securities	$	90,951	$	1,186	$	5,679	$	118	$	96,630	$	1,304

As of March 31, 2013, the Company does not intend to sell these fixed maturity securities and does not believe it is more likely than not that it will be required to sell these fixed maturity securities before the recovery of the fair value up to the current amortized cost of the investment, which may be maturity. As of March 31, 2013, the Company has the ability and intent to hold the equity securities until the recovery of the fair value up to the current cost of the investment. However, unforeseen facts and circumstances may cause the Company to sell fixed maturity and equity securities in the ordinary course of managing its portfolio to meet certain diversification, credit quality, asset-liability management and liquidity guidelines.

Unrealized losses on non-investment grade securities are principally related to asset and mortgage-backed securities and were the result of wider credit spreads resulting from higher risk premiums since the time of initial purchase, largely due to macroeconomic conditions and credit market deterioration, including the impact of lower real estate valuations. As of March 31, 2013 and December 31, 2012, approximately $46.3 million and $61.5 million, respectively, of gross unrealized losses greater than 12 months was associated with non-investment grade asset and mortgage-backed securities. This class of securities was evaluated based on actual and projected collateral losses relative to the securities' positions in the respective securitization trusts and security specific expectations of cash flows. This evaluation also takes into consideration credit enhancement, measured in terms of (i) subordination from other classes of securities in the trust that are contractually obligated to absorb losses before the class of security the Company owns, and (ii) the expected impact of other structural features embedded in the securitization trust beneficial to the class of securities the Company owns, such as overcollateralization and excess spread.

Investment Income, Net of Related Expenses

Major categories of investment income, net of related expenses, consist of the following (dollars in thousands):

	Three months ended
	March 31,
	2013		2012
Fixed maturity securities available-for-sale	$	239,244	$	191,418
Mortgage loans on real estate		28,243		14,965
Policy loans		17,910		16,783
Funds withheld at interest		137,259		115,014
Short-term investments		813		988
Other invested assets		13,922		11,322
Investment revenue		437,391		350,490
Investment expense		12,260		9,550
Investment income, net of related expenses	$	425,131	$	340,940

Investment Related Gains (Losses), Net

Investment related gains (losses), net consist of the following (dollars in thousands):

		Three months ended
		March 31,
		2013		2012
Fixed maturities and equity securities available for sale:
	Other-than-temporary impairment losses on fixed maturities	$	(202)	$	(7,607)
	Portion of loss recognized in accumulated other comprehensive income (before taxes)		--		(7,221)
	Net other-than-temporary impairment losses on fixed maturities recognized in earnings		(202)		(14,828)
	Impairment losses on equity securities		--		(839)
	Gain on investment activity		21,680		22,312
	Loss on investment activity		(11,212)		(7,504)
Other impairment losses and change in mortgage loan provision			(1,626)		(5,843)
Derivatives and other, net			85,731		50,222
Total investment related gains (losses), net		$	94,371	$	43,520

The net other-than-temporary impairment losses on fixed maturity securities recognized in earnings were $0.2 million and $14.8 million in the first three months of 2013 and 2012, respectively. The other-than-temporary impairments in the first three months of 2012 were primarily due to a decline in value of structured securities with exposure to commercial mortgages and general credit deterioration in select corporate and foreign securities. The increase in derivatives and other is primarily due to an increase in the fair value of free-standing derivatives.

During the three months ended March 31, 2013 and 2012, the Company sold fixed maturity and equity securities with fair values of $204.3 million and $248.1 million at losses of $11.2 million and $7.5 million, respectively. The Company generally does not engage in short-term buying and selling of securities.

Securities Borrowing and Other

The Company participates in a securities borrowing program whereby securities, which are not reflected on the Company's condensed consolidated balance sheets, are borrowed from a third party. The Company is required to maintain a minimum of 100% of the market value of the borrowed securities as collateral, which consists of rights to reinsurance treaty cash flows. The Company had borrowed securities with an amortized cost of $87.5 million as of March 31, 2013 and December 31, 2012, which was equal to the market value in both periods. The borrowed securities are used to provide collateral under an affiliated reinsurance transaction.

The Company also participates in a repurchase/reverse repurchase program in which securities, reflected as investments on the Company's condensed consolidated balance sheets, are pledged to a third party. In return, the Company receives securities from the third party with an estimated fair value equal to a minimum of 100% of the securities pledged. The securities received are not reflected on the Company's condensed consolidated balance sheets. As of March 31, 2013 the Company had pledged securities with an amortized cost of $284.5 million and an estimated fair value of $309.7 million, and in return the Company received securities with an estimated fair value of $343.2 million. As of December 31, 2012 the Company had pledged securities with an amortized cost of $290.2 million and an estimated fair value of $305.9 million, and in return the Company received securities with an estimated fair value of $342.0 million.

Mortgage Loans on Real Estate

Mortgage loans represented approximately 7.0% of the Company's total investments as of March 31, 2013 and December 31, 2012. The Company makes mortgage loans on income producing properties, such as apartments, retail and office buildings, and light industrial facilities. Loan-to-value ratios at the time of loan approval are 75% or less. The distribution of mortgage loans, gross of valuation allowances, by property type is as follows as of March 31, 2013 and December 31, 2012 (dollars in thousands):

		March 31, 2013				December 31, 2012
		Recorded		Percentage		Recorded		Percentage
Property type:		Investment		of Total		Investment		of Total
	Apartment	$	230,762	9.9	%	$	229,266	9.9	%
	Retail		715,036	30.6			669,958	29.0
	Office building		836,332	35.8			825,406	35.7
	Industrial		426,011	18.2			455,682	19.7
	Other commercial		126,974	5.5			131,855	5.7
Total		$	2,335,115	100.0	%	$	2,312,167	100.0	%

As of March 31, 2013 and December 31, 2012, the Company's mortgage loans, gross of valuation allowances, were distributed throughout the United States as follows (dollars in thousands):

		March 31, 2013				December 31, 2012
		Recorded		Percentage		Recorded		Percentage
		Investment		of Total		Investment		of Total
Pacific		$	597,540	25.6	%	$	593,589	25.7	%
South Atlantic			483,398	20.7			477,068	20.5
Mountain			251,406	10.8			233,174	10.1
Middle Atlantic			286,314	12.3			300,475	13.0
West North Central			160,203	6.8			168,063	7.3
East North Central			243,202	10.4			224,122	9.7
West South Central			160,117	6.9			161,451	7.0
East South Central			62,323	2.7			62,789	2.7
New England			90,612	3.8			91,436	4.0
	Total	$	2,335,115	100.0	%	$	2,312,167	100.0	%

The maturities of the mortgage loans, gross of valuation allowances, as of March 31, 2013 and December 31, 2012 are as follows (dollars in thousands):


		March 31, 2013		December 31, 2012
Due within five years		$	1,157,373	$	1,187,387
Due after five years through ten years			832,292		776,655
Due after ten years			345,450		348,125
	Total	$	2,335,115	$	2,312,167

Information regarding the Company's credit quality indicators for its recorded investment in mortgage loans, gross of valuation allowances, as of March 31, 2013 and December 31, 2012 is as follows (dollars in thousands):

Internal credit risk grade:			March 31, 2013		December 31, 2012
	High investment grade		$	1,473,018	$	1,235,605
	Investment grade			622,794		834,494
	Average			147,650		132,607
	Watch list			62,679		76,463
	In or near default			28,974		32,998
		Total	$	2,335,115	$	2,312,167

The age analysis of the Company's past due recorded investment in mortgage loans, gross of valuation allowances, as of March 31, 2013 and December 31, 2012 is as follows (dollars in thousands):

			March 31, 2013		December 31, 2012
31-60 days past due			$	6,594	$	7,504
61-90 days past due				--		--
Greater than 90 days				8,342		16,886
	Total past due			14,936		24,390
Current				2,320,179		2,287,777
		Total	$	2,335,115	$	2,312,167

The following table presents the recorded investment in mortgage loans, by method of evaluation of credit loss, and the related valuation allowances, by type of credit loss, at (dollars in thousands):

			March 31, 2013		December 31, 2012
Mortgage loans:
	Evaluated individually for credit losses		$	41,167	$	39,956
	Evaluated collectively for credit losses			2,293,948		2,272,211
		Mortgage loans, gross of valuation allowances		2,335,115		2,312,167

Valuation allowances:
	Specific for credit losses			6,008		6,980
	Non-specifically identified credit losses			3,916		4,600
		Total valuation allowances		9,924		11,580

		Mortgage loans, net of valuation allowances	$	2,325,191	$	2,300,587

Information regarding the Company's loan valuation allowances for mortgage loans for the three months ended March 31, 2013 and 2012 is as follows (dollars in thousands):

	Three Months Ended March 31,
	2013		2012
Balance, beginning of period	$	11,580	$	11,793
Charge-offs		(852)		(2,193)
Provision (release)		(804)		5,050
Balance, end of period	$	9,924	$	14,650

Information regarding the portion of the Company's mortgage loans that were impaired as of March 31, 2013 and December 31, 2012 is as follows (dollars in thousands):

		Unpaid Principal Balance		Recorded Investment		Related Allowance		Carrying Value
March 31, 2013:
Impaired mortgage loans with no valuation allowance recorded		$	14,802	$	14,259	$	--	$	14,259
Impaired mortgage loans with valuation allowance recorded			26,975		26,908		6,008		20,900
	Total impaired mortgage loans	$	41,777	$	41,167	$	6,008	$	35,159

December 31, 2012:
Impaired mortgage loans with no valuation allowance recorded		$	13,039	$	12,496	$	--	$	12,496
Impaired mortgage loans with valuation allowance recorded			27,527		27,460		6,980		20,480
	Total impaired mortgage loans	$	40,566	$	39,956	$	6,980	$	32,976

The Company's average investment in impaired mortgage loans and the related interest income are reflected in the table below for the periods indicated (dollars in thousands):

		Three Months Ended
		March 31, 2013				March 31, 2012
		Average Investment⁽¹⁾		Interest Income		Average Investment⁽¹⁾		Interest Income
Impaired mortgage loans with no valuation allowance recorded		$	13,378	$	135	$	21,571	$	169
Impaired mortgage loans with valuation allowance recorded			27,184		240		37,308		308
	Total	$	40,562	$	375	$	58,879	$	477

(1)	Average recorded investment represents the average loan balances as of the beginning of period and all subsequent quarterly end of period balances.

The Company did not acquire any impaired mortgage loans during the three months ended March 31, 2013 and 2012. The Company had $8.3 million and $16.9 million of mortgage loans, gross of valuation allowances, that were on nonaccrual status at March 31, 2013 and December 31, 2012, respectively.

Policy Loans

Policy loans comprised approximately 3.8% and 3.9% of the Company's total investments as of March 31, 2013 and December 31, 2012, respectively, substantially all of which are associated with one client. These policy loans present no credit risk because the amount of the loan cannot exceed the obligation due to the ceding company upon the death of the insured or surrender of the underlying policy. The provisions of the treaties in force and the underlying policies determine the policy loan interest rates. As policy loans represent premature distributions of policy liabilities, they have the effect of reducing future disintermediation risk. In addition, the Company earns a spread between the interest rate earned on policy loans and the interest rate credited to corresponding liabilities.

Funds Withheld at Interest

Funds withheld at interest comprised approximately 17.3% and 17.0% of the Company's total investments as of March 31, 2013 and December 31, 2012, respectively. As of March 31, 2013 and December 31, 2012, approximately 70.2% and 69.7%, respectively, of the Company's funds withheld at interest balance, net of embedded derivatives, was associated with one client. For reinsurance agreements written on a modified coinsurance basis and certain agreements written on a coinsurance funds withheld basis, assets equal to the net statutory reserves are withheld and legally owned and managed by the ceding company and are reflected as funds withheld at interest on the Company's condensed consolidated balance sheets. In the event of a ceding company's insolvency, the Company would need to assert a claim on the assets supporting its reserve liabilities. However, the risk of loss to the Company is mitigated by its ability to offset amounts it owes the ceding company for claims or allowances with amounts owed to the Company from the ceding company. The Company is subject to the investment performance on the withheld assets, although it does not directly control them. These assets are primarily fixed maturity investment securities and pose risks similar to the fixed maturity securities the Company owns. To mitigate this risk, the Company helps set the investment guidelines followed by the ceding company and monitors compliance.

Other Invested Assets

Other invested assets include equity securities, collateral (included in other), limited partnership interests, real estate joint ventures, real estate held-for-investment (included in other), structured loans and derivative contracts. Other invested assets represented approximately 3.4% and 3.5% of the Company's total investments as of March 31, 2013 and December 31, 2012, respectively. Carrying values of these assets as of March 31, 2013 and December 31, 2012 are as follows (dollars in thousands):

		March 31, 2013		December 31, 2012
Equity securities		$	220,665	$	222,700
Limited partnerships and real estate joint ventures			375,451		356,419
Structured loans			272,592		306,497
Derivatives			151,761		168,208
Other			109,182		105,719
	Total other invested assets	$	1,129,651	$	1,159,543

Netting Arrangements

Certain of the Company's derivatives are subject to enforceable master netting arrangements and reported as a net asset or liability in the condensed consolidated balance sheets. The Company nets all derivatives that are subject to such arrangements.

The Company has elected to include all derivatives, except embedded derivatives, in the tables below, irrespective of whether they are subject to an enforceable master netting arrangement or a similar agreement. See “Securities Borrowing and Other” above for information regarding the Company's securities borrowing and repurchase/reverse repurchase programs. See Note 5 – “Derivative Instruments” for information regarding the Company's bifurcated embedded derivatives.

The following table provides information relating to the Company's derivative instruments as of March 31, 2013 and December 31, 2012 (dollars in thousands):

								Gross Amounts Not Offset in the Balance Sheet
				Gross Amounts		Net Amounts				Cash Collateral
		Gross Amounts		Offset in the		Presented in the		Financial		Pledged/
		Recognized		Balance Sheet		Balance Sheet		Instruments		Received		Net Amount
March 31, 2013:
	Derivative assets	$	175,236	$	(23,475)	$	151,761	$	(17,664)	$	(126,329)	$	7,768
	Derivative liabilities		42,079		(23,475)		18,604		(14,118)		(6,250)		(1,764)

December 31, 2012:
	Derivative assets	$	190,634	$	(22,426)	$	168,208	$	(22,458)	$	(136,414)	$	9,336
	Derivative liabilities		54,078		(22,426)		31,652		(1,565)		(27,867)		2,220

- Definition

Tabular disclosure of investments in certain debt and equity securities (and certain other trading assets) which include all debt and equity securities (other than those equity securities accounted for under the equity or cost methods of accounting) with readily determinable fair values. Other trading assets include assets that are carried on the balance sheet at fair value and held for trading purposes. A debt security represents a creditor relationship with an enterprise that is in the form of a security. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities (and other trading assets).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 3, 19, 20, 21, 22, 137
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27405-111563

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27232-111563

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Debt Security
-URI http://asc.fasb.org/extlink&oid=6509901
-Topic 320

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Equity Security
-URI http://asc.fasb.org/extlink&oid=6511694
-Topic 320

+ Details

Investments (Details 4) - USD ($)	Mar. 31, 2013	Dec. 31, 2012
Certain Loans Acquired in Transfer Accounted for as Available-for-sale Debt Securities [Abstract]
Certain Loans Acquired in Transfer Accounted for as Available-for-sale Debt Securities, Outstanding Balance	$ 172,800,000	$ 108,831,000
Certain Loans Acquired in Transfer Accounted for as Available-for-sale Debt Securities, Carrying Amount, Net	$ 134,564,000	$ 84,765,000

Fair Value Disclosures (Details 3) - USD ($)	3 Months Ended
Fair Value Disclosures (Details 3) - USD ($)	Mar. 31, 2013	Mar. 31, 2012
Funds Withheld At Interest Embedded Derivatives [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance, Beginning of period	$ (243,177,000)	$ (361,456,000)
Total gains or (losses) (realized/unrealized)
Investment income, net of related expenses	0	0
Investment related gains (losses), net	86,988,000	(9,428,000)
Claims and other policy benefits	0	0
Interest credited	0	0
Policy acquisition costs and other insurance expenses	0	0
Included in other comprehensive income	0	0
Purchases	0	0
Sales	0	0
Settlements	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, End of period	(156,189,000)	(370,884,000)
Unrealized Gains And Losses Recorded In Earnings For The Period Relating To Those Level 3 Assets And Liabilities That Were Still Held At The End Of The Period
Investment income, net of related expenses	0	0
Investment related gains (losses), net	86,988,000	(9,428,000)
Claims & other policy benefits	0	0
Interest credited	0	0
Policy acquisition costs and other insurance expenses	0	0
Other Debt Securities Member
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance, Beginning of period		11,489,000
Total gains or (losses) (realized/unrealized)
Investment income, net of related expenses		0
Investment related gains (losses), net		0
Claims and other policy benefits		0
Interest credited		0
Policy acquisition costs and other insurance expenses		0
Included in other comprehensive income		338,000
Purchases		0
Sales		0
Settlements		0
Transfers into Level 3		0
Transfers out of Level 3		0
Balance, End of period		11,827,000
Unrealized Gains And Losses Recorded In Earnings For The Period Relating To Those Level 3 Assets And Liabilities That Were Still Held At The End Of The Period
Investment income, net of related expenses		0
Investment related gains (losses), net		0
Claims & other policy benefits		0
Interest credited		0
Policy acquisition costs and other insurance expenses		0
Reinsurance Ceded Receivable Embedded Derivatives [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance, Beginning of period		4,945,000
Total gains or (losses) (realized/unrealized)
Investment income, net of related expenses		0
Investment related gains (losses), net		0
Claims and other policy benefits		0
Interest credited		0
Policy acquisition costs and other insurance expenses		(1,329,000)
Included in other comprehensive income		0
Purchases		0
Sales		0
Settlements		(102,000)
Transfers into Level 3		0
Transfers out of Level 3		0
Balance, End of period		3,514,000
Unrealized Gains And Losses Recorded In Earnings For The Period Relating To Those Level 3 Assets And Liabilities That Were Still Held At The End Of The Period
Investment income, net of related expenses		0
Investment related gains (losses), net		0
Claims & other policy benefits		0
Interest credited		0
Policy acquisition costs and other insurance expenses		(1,188,000)
Interest Sensitive Contract Liabilities Embedded Derivatives [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance, Beginning of period	(912,361,000)	(1,028,241,000)
Total gains or (losses) (realized/unrealized)
Investment income, net of related expenses	0	0
Investment related gains (losses), net	51,314,000	146,375,000
Claims and other policy benefits	0	2,278,000
Interest credited	(32,996,000)	(21,193,000)
Policy acquisition costs and other insurance expenses	0	0
Included in other comprehensive income	0	0
Purchases	(13,860,000)	(23,590,000)
Sales	0	0
Settlements	17,427,000	21,089,000
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, End of period	(890,476,000)	(903,282,000)
Unrealized Gains And Losses Recorded In Earnings For The Period Relating To Those Level 3 Assets And Liabilities That Were Still Held At The End Of The Period
Investment income, net of related expenses	0	0
Investment related gains (losses), net	50,123,000	144,624,000
Claims & other policy benefits	0	2,037,000
Interest credited	(50,424,000)	(42,107,000)
Policy acquisition costs and other insurance expenses	0	0
Short Term Investments Member
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance, Beginning of period	22,031,000
Total gains or (losses) (realized/unrealized)
Investment income, net of related expenses	(3,000)
Investment related gains (losses), net	0
Claims and other policy benefits	0
Interest credited	0
Policy acquisition costs and other insurance expenses	0
Included in other comprehensive income	(27,000)
Purchases	0
Sales	0
Settlements	0
Transfers into Level 3	0
Transfers out of Level 3	0
Balance, End of period	22,001,000
Unrealized Gains And Losses Recorded In Earnings For The Period Relating To Those Level 3 Assets And Liabilities That Were Still Held At The End Of The Period
Investment income, net of related expenses	(4,000)
Investment related gains (losses), net	0
Claims & other policy benefits	0
Interest credited	0
Policy acquisition costs and other insurance expenses	0
Availableforsale Securities Member \| Corporate Debt Securities Member
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance, Beginning of period	1,668,563,000	974,169,000
Total gains or (losses) (realized/unrealized)
Investment income, net of related expenses	(2,027,000)	30,000
Investment related gains (losses), net	(1,262,000)	(585,000)
Claims and other policy benefits	0	0
Interest credited	0	0
Policy acquisition costs and other insurance expenses	0	0
Included in other comprehensive income	963,000	(682,000)
Purchases	74,671,000	21,161,000
Sales	(16,278,000)	(9,408,000)
Settlements	(65,366,000)	(20,875,000)
Transfers into Level 3	3,773,000	17,444,000
Transfers out of Level 3	(16,134,000)	(3,583,000)
Balance, End of period	1,646,903,000	977,671,000
Unrealized Gains And Losses Recorded In Earnings For The Period Relating To Those Level 3 Assets And Liabilities That Were Still Held At The End Of The Period
Investment income, net of related expenses	(2,027,000)	30,000
Investment related gains (losses), net	(202,000)	(727,000)
Claims & other policy benefits	0	0
Interest credited	0	0
Policy acquisition costs and other insurance expenses	0	0
Availableforsale Securities Member \| Residential Mortgage Backed Securities Member
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance, Beginning of period	93,931,000	81,655,000
Total gains or (losses) (realized/unrealized)
Investment income, net of related expenses	105,000	110,000
Investment related gains (losses), net	(173,000)	279,000
Claims and other policy benefits	0	0
Interest credited	0	0
Policy acquisition costs and other insurance expenses	0	0
Included in other comprehensive income	2,514,000	1,580,000
Purchases	40,538,000	244,000
Sales	(1,599,000)	(8,004,000)
Settlements	(4,923,000)	(1,800,000)
Transfers into Level 3	10,324,000	0
Transfers out of Level 3	0	(19,629,000)
Balance, End of period	140,717,000	54,435,000
Unrealized Gains And Losses Recorded In Earnings For The Period Relating To Those Level 3 Assets And Liabilities That Were Still Held At The End Of The Period
Investment income, net of related expenses	105,000	106,000
Investment related gains (losses), net	0	(108,000)
Claims & other policy benefits	0	0
Interest credited	0	0
Policy acquisition costs and other insurance expenses	0	0
Availableforsale Securities Member \| Asset Backed Securities Member
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance, Beginning of period	232,391,000	193,492,000
Total gains or (losses) (realized/unrealized)
Investment income, net of related expenses	878,000	249,000
Investment related gains (losses), net	(1,747,000)	(670,000)
Claims and other policy benefits	0	0
Interest credited	0	0
Policy acquisition costs and other insurance expenses	0	0
Included in other comprehensive income	12,036,000	6,696,000
Purchases	55,881,000	0
Sales	(8,297,000)	0
Settlements	(5,877,000)	(3,865,000)
Transfers into Level 3	2,966,000	1,080,000
Transfers out of Level 3	0	(50,620,000)
Balance, End of period	288,231,000	146,362,000
Unrealized Gains And Losses Recorded In Earnings For The Period Relating To Those Level 3 Assets And Liabilities That Were Still Held At The End Of The Period
Investment income, net of related expenses	882,000	249,000
Investment related gains (losses), net	0	(607,000)
Claims & other policy benefits	0	0
Interest credited	0	0
Policy acquisition costs and other insurance expenses	0	0
Availableforsale Securities Member \| Commercial Mortgage Backed Securities Member
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance, Beginning of period	167,006,000	115,976,000
Total gains or (losses) (realized/unrealized)
Investment income, net of related expenses	502,000	588,000
Investment related gains (losses), net	(870,000)	(12,075,000)
Claims and other policy benefits	0	0
Interest credited	0	0
Policy acquisition costs and other insurance expenses	0	0
Included in other comprehensive income	12,500,000	13,521,000
Purchases	0	0
Sales	(1,604,000)	0
Settlements	(2,240,000)	0
Transfers into Level 3	0	10,846,000
Transfers out of Level 3	0	(10,178,000)
Balance, End of period	175,294,000	118,678,000
Unrealized Gains And Losses Recorded In Earnings For The Period Relating To Those Level 3 Assets And Liabilities That Were Still Held At The End Of The Period
Investment income, net of related expenses	501,000	588,000
Investment related gains (losses), net	0	(12,075,000)
Claims & other policy benefits	0	0
Interest credited	0	0
Policy acquisition costs and other insurance expenses	0	0
Availableforsale Securities Member \| US Treasury And Government Member
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance, Beginning of period	4,538,000
Total gains or (losses) (realized/unrealized)
Investment income, net of related expenses	0
Investment related gains (losses), net	0
Claims and other policy benefits	0
Interest credited	0
Policy acquisition costs and other insurance expenses	0
Included in other comprehensive income	0
Purchases	0
Sales	0
Settlements	0
Transfers into Level 3	0
Transfers out of Level 3	(4,538,000)
Balance, End of period	0
Unrealized Gains And Losses Recorded In Earnings For The Period Relating To Those Level 3 Assets And Liabilities That Were Still Held At The End Of The Period
Investment income, net of related expenses	0
Investment related gains (losses), net	0
Claims & other policy benefits	0
Interest credited	0
Policy acquisition costs and other insurance expenses	0
Availableforsale Securities Member \| US States And Political Subdivisions Member
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance, Beginning of period	43,212,000	10,373,000
Total gains or (losses) (realized/unrealized)
Investment income, net of related expenses	9,000	(5,000)
Investment related gains (losses), net	(4,000)	(4,000)
Claims and other policy benefits	0	0
Interest credited	0	0
Policy acquisition costs and other insurance expenses	0	0
Included in other comprehensive income	(553,000)	406,000
Purchases	0	0
Sales	0	0
Settlements	(25,000)	(23,000)
Transfers into Level 3	0	0
Transfers out of Level 3	0	(5,508,000)
Balance, End of period	42,639,000	5,239,000
Unrealized Gains And Losses Recorded In Earnings For The Period Relating To Those Level 3 Assets And Liabilities That Were Still Held At The End Of The Period
Investment income, net of related expenses	9,000	(5,000)
Investment related gains (losses), net	0	0
Claims & other policy benefits	0	0
Interest credited	0	0
Policy acquisition costs and other insurance expenses	0	$ 0
Availableforsale Securities Member \| Other Foreign Government, Supranational And Foreign Government-Sponsored Enterprises
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance, Beginning of period	28,280,000
Total gains or (losses) (realized/unrealized)
Investment income, net of related expenses	(75,000)
Investment related gains (losses), net	0
Claims and other policy benefits	0
Interest credited	0
Policy acquisition costs and other insurance expenses	0
Included in other comprehensive income	(340,000)
Purchases	0
Sales	0
Settlements	0
Transfers into Level 3	0
Transfers out of Level 3	0
Balance, End of period	27,865,000
Unrealized Gains And Losses Recorded In Earnings For The Period Relating To Those Level 3 Assets And Liabilities That Were Still Held At The End Of The Period
Investment income, net of related expenses	(75,000)
Investment related gains (losses), net	0
Claims & other policy benefits	0
Interest credited	0
Policy acquisition costs and other insurance expenses	$ 0

Derivative Instruments (Details 7) - USD ($)	Mar. 31, 2013	Dec. 31, 2012
Credit Exposure of Derivative Contracts
Estimated fair value of derivatives in net asset (liability) position	$ 133,157,000	$ 136,558,000
Cash provided as collateral	(6,250,000)	(27,867,000)
Securities provided as collateral	(14,118,000)	(1,565,000)
Cash received as collateral	(126,329,000)	(136,414,000)
Securities received as collateral	(17,664,000)	(22,458,000)
Net credit exposure	9,532,000	7,118,000
Margin account related to exchange-traded futures	$ 3,529,000	$ 5,605,000

Earnings Per Share (Narrative Details) - shares	3 Months Ended
Earnings Per Share (Narrative Details) - shares	Mar. 31, 2013	Mar. 31, 2012
Stock Options Member
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount	1,500,000	1,400,000
Contingently Issuable Shares Member
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount	900,000	700,000

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 13, 14
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Diluted Earnings Per Share
-URI http://asc.fasb.org/extlink&oid=6510752

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Contingent Stock Agreement
-URI http://asc.fasb.org/extlink&oid=6508534

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Fair Value Disclosures

3 Months Ended

Mar. 31, 2013

Statement - Fair Value Disclosures

Fair Value Disclosures

6. Fair Value of Assets and Liabilities

Fair Value Measurement

General accounting principles for Fair Value Measurements and Disclosures define fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. These principles also establish a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value and describes three levels of inputs that may be used to measure fair value:

Level 1 Unadjusted quoted prices in active markets for identical assets or liabilities. Active markets are defined as having the following characteristics for the measured asset/liability: (i) many transactions, (ii) current prices, (iii) price quotes not varying substantially among market makers, (iv) narrow bid/ask spreads and (v) most information publicly available. The Company's Level 1 assets and liabilities include investment securities that are traded in exchange markets.

Level 2 Observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or market standard valuation techniques and assumptions with significant inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Such observable inputs include benchmarking prices for similar assets in active, liquid markets, quoted prices in markets that are not active and observable yields and spreads in the market. The Company's Level 2 assets and liabilities include investment securities with quoted prices that are traded less frequently than exchange-traded instruments and derivative contracts whose values are determined using market standard valuation techniques. This category primarily includes corporate securities, Canadian and Canadian provincial government securities, and residential and commercial mortgage-backed securities, among others. Level 2 valuations are generally obtained from third party pricing services for identical or comparable assets or liabilities or through the use of valuation methodologies using observable market inputs. Prices from services are validated through analytical reviews and assessment of current market activity.

Level 3 Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the related assets or liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using market standard valuation techniques described above. When observable inputs are not available, the market standard techniques for determining the estimated fair value of certain securities that trade infrequently, and therefore have little transparency, rely on inputs that are significant to the estimated fair value and that are not observable in the market or cannot be derived principally from or corroborated by observable market data. These unobservable inputs can be based in large part on management judgment or estimation and cannot be supported by reference to market activity. Even though unobservable, management believes these inputs are based on assumptions deemed appropriate given the circumstances and consistent with what other market participants would use when pricing similar assets and liabilities. For the Company's invested assets, this category generally includes corporate securities (primarily private placements and bank loans), asset-backed securities (including those with exposure to subprime mortgages), and to a lesser extent, certain residential and commercial mortgage-backed securities, among others. Prices are determined using valuation methodologies such as discounted cash flow models and other similar techniques. Non-binding broker quotes, which are utilized when pricing service information is not available, are reviewed for reasonableness based on the Company's understanding of the market, and are generally considered Level 3. Under certain circumstances, based on its observations of transactions in active markets, the Company may conclude the prices received from independent third party pricing services or brokers are not reasonable or reflective of market activity. In those instances, the Company would apply internally developed valuation techniques to the related assets or liabilities. Additionally, the Company's embedded derivatives, all of which are associated with reinsurance treaties, are classified in Level 3 since their values include significant unobservable inputs.

When inputs used to measure fair value fall within different levels of the hierarchy, the level within which the fair value measurement is categorized is based on the lowest level input that is significant to the fair value measurement in its entirety. For example, a Level 3 fair value measurement may include inputs that are observable (Levels 1 and 2) and unobservable (Level 3). Therefore, gains and losses for such assets and liabilities categorized within Level 3 may include changes in fair value that are attributable to both observable inputs (Levels 1 and 2) and unobservable inputs (Level 3).

Assets and Liabilities by Hierarchy Level

Assets and liabilities measured at fair value on a recurring basis as of March 31, 2013 and December 31, 2012 are summarized below (dollars in thousands):

March 31, 2013:								Fair Value Measurements Using:
						Total		Level 1		Level 2		Level 3
Assets:
	Fixed maturity securities – available-for-sale:
		Corporate securities			$	12,441,501	$	65,890	$	10,728,708	$	1,646,903
		Canadian and Canadian provincial governments				3,942,198		--		3,942,198		--
		Residential mortgage-backed securities				1,076,770		--		936,053		140,717
		Asset-backed securities				756,544		--		468,313		288,231
		Commercial mortgage-backed securities				1,698,144		--		1,522,850		175,294
		U.S. government and agencies securities				331,201		259,892		71,309		--
		State and political subdivision securities				313,097		--		270,458		42,639
		Other foreign government supranational and foreign
			government-sponsored enterprises			1,842,204		272,823		1,541,516		27,865
				Total fixed maturity securities – available-for-sale		22,401,659		598,605		19,481,405		2,321,649
	Funds withheld at interest – embedded derivatives					(156,189)		--		--		(156,189)
	Cash equivalents					367,876		367,876		--		--
	Short-term investments					157,281		118,621		16,659		22,001
	Other invested assets:
		Non-redeemable preferred stock				84,111		73,446		10,665		--
		Other equity securities				136,554		136,554		--		--
		Derivatives:
			Interest rate swaps			83,662		--		83,662		--
			Interest rate options			16,054		--		16,054		--
			CPI swaps			945		--		945		--
			Credit default swaps			(3,391)		--		(3,391)		--
			Equity options			54,351		--		54,351		--
			Foreign currency swaps			140		--		140		--
		Collateral				25,790		14,118		11,672		--
		Other				7,205		7,205		--		--
				Total other invested assets		405,421		231,323		174,098		--
		Total			$	23,176,048	$	1,316,425	$	19,672,162	$	2,187,461

Liabilities:
	Interest sensitive contract liabilities – embedded derivatives				$	890,476	$	--	$	--	$	890,476
	Other liabilities:
		Derivatives:
			Interest rate swaps			1,463		--		1,463		--
			Foreign currency forwards			7,014		--		7,014		--
			Credit default swaps			(120)		--		(120)		--
			Equity options			(440)		--		(440)		--
			Foreign currency swaps			10,687		--		10,687		--
		Total			$	909,080	$	--	$	18,604	$	890,476

December 31, 2012:								Fair Value Measurements Using:
						Total		Level 1		Level 2		Level 3
Assets:
	Fixed maturity securities – available-for-sale:
		Corporate securities			$	12,380,071	$	43,544	$	10,667,964	$	1,668,563
		Canadian and Canadian provincial governments				4,049,334		--		4,049,334		--
		Residential mortgage-backed securities				1,042,064		--		948,133		93,931
		Asset-backed securities				691,555		--		459,164		232,391
		Commercial mortgage-backed securities				1,698,903		--		1,531,897		167,006
		U.S. government and agencies securities				265,190		192,780		67,872		4,538
		State and political subdivision securities				302,498		--		259,286		43,212
		Other foreign government, supranational and foreign
			government-sponsored enterprises			1,861,999		297,025		1,536,694		28,280
				Total fixed maturity securities – available-for-sale		22,291,614		533,349		19,520,344		2,237,921
	Funds withheld at interest – embedded derivatives					(243,177)		--		--		(243,177)
	Cash equivalents					575,864		575,864		--		--
	Short-term investments					239,131		178,923		38,177		22,031
	Other invested assets:
		Non-redeemable preferred stock				74,841		64,268		10,573		--
		Other equity securities				147,859		147,859		--		--
		Derivatives:
			Interest rate swaps			104,972		--		104,972		--
			Foreign currency forwards			1,017		--		1,017		--
			CPI swaps			1,446		--		1,446		--
			Credit default swaps			(1,741)		--		(1,741)		--
			Equity options			62,514		--		62,514		--
		Collateral				17,002		1,323		15,679		--
		Other				11,951		11,951		--		--
				Total other invested assets		419,861		225,401		194,460		--
		Total			$	23,283,293	$	1,513,537	$	19,752,981	$	2,016,775

Liabilities:
	Interest sensitive contract liabilities – embedded derivatives				$	912,361	$	--	$	--	$	912,361
	Other liabilities:
		Derivatives:
			Interest rate swaps			196		--		196		--
			Foreign currency forwards			2,105		--		2,105		--
			Credit default swaps			1,953		--		1,953		--
			Foreign currency swaps			27,398		--		27,398		--
		Total			$	944,013	$	--	$	31,652	$	912,361

The Company may utilize information from third parties, such as pricing services and brokers, to assist in determining the fair value for certain assets and liabilities; however, management is ultimately responsible for all fair values presented in the Company's financial statements. This includes responsibility for monitoring the fair value process, ensuring objective and reliable valuation practices and pricing of financial instruments, and approving changes to valuation methodologies and pricing sources. The selection of the valuation technique(s) to apply considers the definition of an exit price and the nature of the asset or liability being valued and significant expertise and judgment is required.

The Company performs initial and ongoing analysis and review of the various techniques utilized in determining fair value to ensure that the valuation approaches utilized are appropriate and consistently applied, and that the various assumptions are reasonable. The Company also performs ongoing analysis and review of the information and prices received from third parties to ensure that the prices represent a reasonable estimate of the fair value and to monitor controls around pricing, which includes quantitative and qualitative analysis and is overseen by the Company's investment and accounting personnel. Examples of procedures performed include, but are not limited to, review of pricing trends, comparison of a sample of executed prices of securities sold to the fair value estimates, comparison of fair value estimates to management's knowledge of the current market, and ongoing confirmation that third party pricing services use, wherever possible, market-based parameters for valuation. In addition, the Company utilizes both internal and external cash flow models to analyze the reasonableness of fair values utilizing credit spread and other market assumptions, where appropriate. As a result of the analysis, if the Company determines there is a more appropriate fair value based upon the available market data, the price received from the third party is adjusted accordingly. The Company also determines if the inputs used in estimated fair values received from pricing services are observable by assessing whether these inputs can be corroborated by observable market data.

The fair value of embedded derivative liabilities, including those calculated by third parties, are monitored through the use of attribution reports to quantify the effect of underlying sources of fair value change, including capital market inputs based on policyholder account values, interest rates and short-term and long-term implied volatilities, from period to period. Actuarial assumptions are based on experience studies performed internally in combination with available industry information and are reviewed on a periodic basis, at least annually.

For assets and liabilities reported at fair value, the Company utilizes when available, fair values based on quoted prices in active markets that are regularly and readily obtainable. Generally, these are very liquid investments and the valuation does not require management judgment. When quoted prices in active markets are not available, fair value is based on market valuation techniques, market comparable pricing and the income approach. The use of different techniques, assumptions and inputs may have a material effect on the estimated fair values of the Company's securities holdings. For the quarters ended March 31, 2013 and 2012, the application of market standard valuation techniques applied to similar assets and liabilities has been consistent.

The methods and assumptions the Company uses to estimate the fair value of assets and liabilities measured at fair value on a recurring basis are summarized below.

Fixed Maturity Securities – The fair values of the Company's publicly-traded fixed maturity securities are generally based on prices obtained from independent pricing services. Prices from pricing services are sourced from multiple vendors, and a vendor hierarchy is maintained by asset type based on historical pricing experience and vendor expertise. The Company generally receives prices from multiple pricing services for each security, but ultimately uses the price from the pricing service highest in the vendor hierarchy based on the respective asset type. To validate reasonableness, prices are periodically reviewed as explained above. Consistent with the fair value hierarchy described above, securities with validated quotes from pricing services are generally reflected within Level 2, as they are primarily based on observable pricing for similar assets and/or other market observable inputs. If the pricing information received from third party pricing services is not reflective of market activity or other inputs observable in the market, the Company may challenge the price through a formal process with the pricing service.

If the Company ultimately concludes that pricing information received from the independent pricing service is not reflective of market activity, non-binding broker quotes are used, if available. If the Company concludes the values from both pricing services and brokers are not reflective of market activity, it may override the information from the pricing service or broker with an internally developed valuation; however, this occurs infrequently. Internally developed valuations or non-binding broker quotes are also used to determine fair value in circumstances where vendor pricing is not available. These estimates may use significant unobservable inputs, which reflect the Company's assumptions about the inputs that market participants would use in pricing the asset. Circumstances where observable market data are not available may include events such as market illiquidity and credit events related to the security. Pricing service overrides, internally developed valuations and non-binding broker quotes are generally based on significant unobservable inputs and are reflected as Level 3 in the valuation hierarchy.

The inputs used in the valuation of corporate and government securities include, but are not limited to standard market observable inputs which are derived from, or corroborated by, market observable data including market yield curve, duration, call provisions, observable prices and spreads for similar publicly traded or privately traded issues that incorporate the credit quality and industry sector of the issuer. For structured securities, valuation is based primarily on matrix pricing or other similar techniques using standard market inputs including spreads for actively traded securities, spreads off benchmark yields, expected prepayment speeds and volumes, current and forecasted loss severity, rating, weighted average coupon, weighted average maturity, average delinquency rates, geographic region, debt-service coverage ratios and issuance-specific information including, but not limited to: collateral type, payment terms of the underlying assets, payment priority within the tranche, structure of the security, deal performance and vintage of loans.

When observable inputs are not available, the market standard valuation techniques for determining the estimated fair value of certain types of securities that trade infrequently, and therefore have little or no price transparency, rely on inputs that are significant to the estimated fair value that are not observable in the market or cannot be derived principally from or corroborated by observable market data. These unobservable inputs can be based in large part on management judgment or estimation, and cannot be supported by reference to market activity. Even though unobservable, these inputs are based on assumptions deemed appropriate given the circumstances and are believed to be consistent with what other market participants would use when pricing such securities.

The fair values of private placement securities are primarily determined using a discounted cash flow model. In certain cases these models primarily use observable inputs with a discount rate based upon the average of spread surveys collected from private market intermediaries who are active in both primary and secondary transactions, taking into account, among other factors, the credit quality and industry sector of the issuer and the reduced liquidity associated with private placements. Generally, these securities have been reflected within Level 3. For certain private fixed maturities, the discounted cash flow model may also incorporate significant unobservable inputs, which reflect the Company's own assumptions about the inputs market participants would use in pricing the security. To the extent management determines that such unobservable inputs are not significant to the price of a security, a Level 2 classification is made. Otherwise, a Level 3 classification is used.

Embedded Derivatives – For embedded derivative liabilities associated with the underlying products in reinsurance treaties, primarily equity-indexed and variable annuity treaties, the Company utilizes a discounted cash flow model, which includes an estimate of future equity option purchases and an adjustment for the Company's own credit risk. The variable annuity embedded derivative calculations are performed by third parties based on methodology and input assumptions provided by the Company. To validate the reasonableness of the resulting fair value, the Company's internal actuaries perform reviews and analytical procedures on the results. The capital market inputs to the model, such as equity indexes, short-term equity volatility and interest rates, are generally observable. The valuation also requires certain significant inputs, which are generally not observable and accordingly, the valuation is considered Level 3 in the fair value hierarchy, see “Level 3 Measurements and Transfers” below for a description.

The fair value of embedded derivatives associated with funds withheld reinsurance treaties is determined based upon a total return swap technique with reference to the fair value of the investments held by the ceding company that support the Company's funds withheld at interest asset with an adjustment for the Company's own credit risk. The fair value of the underlying assets is generally based on market observable inputs using industry standard valuation techniques. The valuation also requires certain significant inputs, which are generally not observable and accordingly, the valuation is considered Level 3 in the fair value hierarchy, see “Level 3 Measurements and Transfers” below for a description.

Company's Own Credit Risk – The Company uses a structural default risk model to estimate its own credit risk. The input assumptions are a combination of externally derived and published values (default threshold and uncertainty), market inputs (interest rate, Company equity price per share, Company debt per share, Company equity price volatility) and insurance industry data (Loss Given Default), adjusted for market recoverability.

Cash Equivalents and Short-Term Investments – Cash equivalents and short-term investments include money market instruments, commercial paper and other highly liquid debt instruments. Money market instruments are generally valued using unadjusted quoted prices in active markets that are accessible for identical assets and are primarily classified as Level 1. The fair value of certain other short-term investments, such as floating rate notes and bonds with original maturities less then twelve months, are based upon other market observable data and are typically classified as Level 2. However, certain short-term investments may incorporate significant unobservable inputs resulting in a Level 3 classification. Various time deposits carried as cash equivalents or short-term investments are not measured at estimated fair value and therefore are excluded from the tables presented.

Equity Securities – Equity securities consist principally of exchange-traded funds and preferred stock of publicly and privately traded companies. The fair values of publicly traded equity securities are primarily based on quoted market prices in active markets and are classified within Level 1 in the fair value hierarchy. The fair values of preferred equity securities, for which quoted market prices are not readily available, are based on prices obtained from independent pricing services and these securities are generally classified within Level 2 in the fair value hierarchy.

Derivative Assets and Derivative Liabilities – All of the derivative instruments utilized by the Company are classified within Level 2 on the fair value hierarchy. These derivatives are principally valued using an income approach. Valuations of interest rate contracts, non-option-based, are based on present value techniques, which utilize significant inputs that may include the swap yield curve, LIBOR basis curves, and repurchase rates. Valuations of foreign currency contracts, non-option-based, are based on present value techniques, which utilize significant inputs that may include the swap yield curve, LIBOR basis curves, currency spot rates, and cross currency basis curves. Valuations of credit contracts, non-option-based, are based on present value techniques, which utilize significant inputs that may include the swap yield curve, credit curves, and recovery rates. Valuations of equity market contracts, non-option-based, are based on present value techniques, which utilize significant inputs that may include the swap yield curve, spot equity index levels, and dividend yield curves. Valuations of equity market contracts, option-based, are based on option pricing models, which utilize significant inputs that may include the swap yield curve, spot equity index levels, dividend yield curves, and equity volatility. The Company does not currently have derivatives included in Level 3 measurement.

Level 3 Measurements and Transfers

As of March 31, 2013 and December 31, 2012, respectively, the Company classified approximately 10.4% and 10.0% of its fixed maturity securities in the Level 3 category. These securities primarily consist of private placement corporate securities and bank loans with inactive trading markets. Additionally, the Company has included asset-backed securities with subprime exposure and mortgage-backed securities with below investment grade ratings in the Level 3 category due to market uncertainty associated with these securities and the Company's utilization of information from third parties for the valuation of these securities.

The significant unobservable inputs used in the fair value measurement of the Company's corporate, sovereign, government-backed, other political subdivision and short-term investments are probability of default, liquidity premium and subordination premium. Significant increases (decreases) in any of those inputs in isolation would result in a significantly lower (higher) fair value measurement. Generally, a change in the assumption used for the probability of default is accompanied by a directionally similar change in the assumptions used for the liquidity premium and subordination premium. For securities with a fair value derived using the market comparable pricing valuation technique, liquidity premium is the only significant unobservable input.

The significant unobservable inputs used in the fair value measurement of the Company's asset and mortgage-backed securities are prepayment rates, probability of default, liquidity premium and loss severity in the event of default. Significant increases (decreases) in any of those inputs in isolation would result in a significantly lower (higher) fair value measurement. Generally, a change in the assumption used for the probability of default is accompanied by a directionally similar change in the assumption used for the liquidity premium and loss severity and a directionally opposite change in the assumption used for prepayment rates.

The actuarial assumptions used in the fair value of embedded derivatives which include assumptions related to lapses, withdrawals, and mortality, are based on experience studies performed by the Company in combination with available industry information and are reviewed on a periodic basis, at least annually. The significant unobservable inputs used in the fair value measurement of embedded derivatives are assumptions associated with policyholder experience and selected capital market assumptions for equity-indexed and variable annuities. The selected capital market assumptions, which include long-term implied volatilities, are projections based on short-term historical information. Changes in interest rates, equity indices, equity volatility, the Company's own credit risk, and actuarial assumptions regarding policyholder experience may result in significant fluctuations in the value of embedded derivatives.

Fair value measurements associated with funds withheld reinsurance treaties are generally not materially sensitive to changes in unobservable inputs associated with policyholder experience. The primary drivers of change in these fair values are related to movements of credit spreads, which are generally observable. Increases (decreases) in market credit spreads tend to decrease (increase) the fair value of embedded derivatives. Increases (decreases) in the own credit assumption tend to decrease (increase) the magnitude of the fair value of embedded derivatives.

Fair value measurements associated with variable annuity treaties are sensitive to both capital markets inputs and policyholder experience inputs. Increases (decreases) in lapse rates tend to decrease (increase) the value of the embedded derivatives associated with variable annuity treaties. Increases (decreases) in the long-term volatility assumption tend to increase (decrease) the fair value of embedded derivatives. Increases (decreases) in the own credit assumption tend to decrease (increase) the magnitude of the fair value of embedded derivatives.

The following table presents quantitative information about significant unobservable inputs used in Level 3 fair value measurements developed by the Company, which does not include Level 3 asset and liability measurements provided by third parties, as of March 31, 2013 and December 31, 2012 (dollars in thousands):

March 31, 2013:				Valuation	Unobservable	Range
		Fair Value		Technique(s)	Input	(Weighted Average)
Assets:
	State and political subdivision securities	$	5,364	Market comparable securities	Liquidity premium	1%

	Corporate securities		429,817	Market comparable securities	Liquidity premium	0-2% (1%)

	Short-term investments		22,001	Market comparable securities	Liquidity premium	1%

	Funds withheld at interest- embedded derivatives		(156,189)	Total return swap	Mortality	0-100% (1%)
					Lapse	0-35% (6%)
					Withdrawal	0-5% (3%)
					Own Credit	0-1% (1%)
					Crediting rate	2-4% (3%)

Liabilities:
	Interest sensitive contract liabilities- embedded derivatives- indexed annuities		769,685	Discounted cash flow	Mortality	0-100% (1%)
					Lapse	0-35% (6%)
					Withdrawal	0-5% (3%)
					Option budget projection	2-4% (3%)



March 31, 2013 (continued):				Valuation	Unobservable	Range
		Fair Value		Technique(s)	Input	(Weighted Average)
	Interest sensitive contract liabilities- embedded derivatives- variable annuities		120,791	Discounted cash flow	Mortality	0-100% (2%)
					Lapse	0-25% (5%)
					Withdrawal	0-7% (3%)
					Own Credit	0-1% (1%)
					Long-term volatility	0-27% (13%)

December 31, 2012:				Valuation	Unobservable	Range
		Fair Value		Technique(s)	Input	(Weighted Average)
Assets:
	State and political subdivision securities	$	5,451	Market comparable securities	Liquidity premium	1%

	Corporate securities		450,177	Market comparable securities	Liquidity premium	0-2% (1%)

	Short-term investments		22,031	Market comparable securities	Liquidity premium	1%

	Funds withheld at interest- embedded derivatives		(243,177)	Total return swap	Mortality	0-100% (1%)
					Lapse	0-35% (6%)
					Withdrawal	0-5% (3%)
					Own Credit	0-1% (1%)
					Crediting rate	2-4% (3%)
Liabilities:
	Interest sensitive contract liabilities- embedded derivatives- indexed annuities		740,256	Discounted cash flow	Mortality	0-100% (1%)
					Lapse	0-35% (6%)
					Withdrawal	0-5% (3%)
					Option budget projection	2-4% (3%)


	Interest sensitive contract liabilities- embedded derivatives- variable annuities		172,105	Discounted cash flow	Mortality	0-100% (2%)
					Lapse	0-25% (5%)
					Withdrawal	0-7% (3%)
					Own Credit	0-1% (1%)
					Long-term volatility	0-27% (14%)

The Company recognizes transfers of financial instruments into and out of levels within the fair value hierarchy at the beginning of the quarter in which the actual event or change in circumstances that caused the transfer occurs. Financial instruments transferred into Level 3 are due to a lack of observable market transactions and price information. Financial instruments are transferred out of Level 3 when circumstances change such that significant inputs can be corroborated with market observable data. This may be due to a significant increase in market activity for the financial instrument, a specific event, one or more significant input(s) becoming observable. Transfers out of Level 3 were primarily the result of the Company using observable pricing information or a third party pricing quotation that appropriately reflects the fair value of those financial instruments, without the need for adjustment based on the Company's own assumptions regarding the characteristics of a specific financial instrument or the current liquidity in the market. In addition, certain transfers out of Level 3 were also due to increased observations of market transactions and price information for those financial instruments.

Transfers from Level 1 to Level 2 are due to the lack of observable market data when pricing these securities, while transfers from Level 2 to Level 1 are due to an increase in the availability of market observable data in an active market. The following tables present the transfers between Level 1 and Level 2 during the three months ended March 31, 2013 and 2012 (dollars in thousands):

		Three months ended March 31,
		2013				2012
		Transfers from		Transfers from		Transfers from		Transfers from
		Level 1 to		Level 2 to		Level 1 to		Level 2 to
		Level 2		Level 1		Level 2		Level 1
Fixed maturity securities - available-for-sale:
	Corporate securities	$	--	$	14,012	$	--	$	4
Total fixed maturity securities		$	--	$	14,012	$	--	$	4

The tables below provide a summary of the changes in fair value of Level 3 assets and liabilities for the three months ended March 31, 2013, as well as the portion of gains or losses included in income for the three months ended March 31, 2013 attributable to unrealized gains or losses related to those assets and liabilities still held at March 31, 2013 (dollars in thousands):

For the three months ended March 31, 2013:				Fixed maturity securities - available-for-sale
							Residential				Commercial		U.S.
							mortgage-				mortgage-	Government
				Corporate			backed		Asset-backed		backed	and agencies
				securities			securities		securities		securities		securities
Fair value, beginning of period				$	1,668,563	$	93,931	$	232,391	$	167,006	$	4,538
	Total gains/losses (realized/unrealized)
		Included in earnings, net:
			Investment income, net of related expenses		(2,027)		105		878		502		--
			Investment related gains (losses), net		(1,262)		(173)		(1,747)		(870)		--
			Claims & other policy benefits		--		--		--		--		--
			Interest credited		--		--		--		--		--
			Policy acquisition costs and other insurance expenses		--		--		--		--		--
		Included in other comprehensive income			963		2,514		12,036		12,500		--
	Purchases⁽¹⁾				74,671		40,538		55,881		--		--
	Sales⁽¹⁾				(16,278)		(1,599)		(8,297)		(1,604)		--
	Settlements⁽¹⁾				(65,366)		(4,923)		(5,877)		(2,240)		--
	Transfers into Level 3				3,773		10,324		2,966		--		--
	Transfers out of Level 3				(16,134)		--		--		--		(4,538)
Fair value, end of period				$	1,646,903	$	140,717	$	288,231	$	175,294	$	--

Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
		Included in earnings, net:
			Investment income, net of related expenses	$	(2,027)	$	105	$	882	$	501	$	--
			Investment related gains (losses), net		(202)		--		--		--		--
			Claims & other policy benefits		--		--		--		--		--
			Interest credited		--		--		--		--		--
			Policy acquisition costs and other insurance expenses		--		--		--		--		--

For the three months ended March 31, 2013 (continued):				Fixed maturity securities
				available-for-sale
							Other foreign
					State		government,		Funds withheld				Interest sensitive
					and political		supranational and		at interest-				contract liabilities
					subdivision		foreign government-		embedded		Short-term		embedded
					securities		sponsored enterprises		derivative		investments		derivatives
Fair value, beginning of period					$	43,212	$	28,280	$	(243,177)	$	22,031	$	(912,361)
	Total gains/losses (realized/unrealized)
		Included in earnings, net:
			Investment income, net of related expenses			9		(75)		--		(3)		--
			Investment related gains (losses), net			(4)		--		86,988		--		51,314
			Claims & other policy benefits			--		--		--		--		--
			Interest credited			--		--		--		--		(32,996)
			Policy acquisition costs and other insurance expenses			--		--		--		--		--
		Included in other comprehensive income				(553)		(340)		--		(27)		--
	Purchases⁽¹⁾					--		--		--		--		(13,860)
	Sales⁽¹⁾					--		--		--		--		--
	Settlements⁽¹⁾					(25)		--		--		--		17,427
	Transfers into Level 3					--		--		--		--		--
	Transfers out of Level 3					--		--		--		--		--
Fair value, end of period					$	42,639	$	27,865	$	(156,189)	$	22,001	$	(890,476)

Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
		Included in earnings, net:
			Investment income, net of related expenses		$	9	$	(75)	$	--	$	(4)	$	--
			Investment related gains (losses), net			--		--		86,988		--		50,123
			Claims & other policy benefits			--		--		--		--		--
			Interest credited			--		--		--		--		(50,424)
			Policy acquisition costs and other insurance expenses			--		--		--		--		--

(1)			The amount reported within purchases, sales and settlements is the purchase price (for purchases) and the sales/settlement proceeds (for sales and settlements) based upon the actual date purchased or sold/settled. Items purchased and sold/settled in the same period are excluded from the rollforward. The Company had no issuances during the period.

The tables below provide a summary of the changes in fair value of Level 3 assets and liabilities for the three months ended March 31, 2012, as well as the portion of gains or losses included in income for the three and nine months ended March 31, 2012 attributable to unrealized gains or losses related to those assets and liabilities still held at March 31, 2012 (dollars in thousands)

For the three months ended March 31, 2012:				Fixed maturity securities - available-for-sale
							Residential				Commercial		State
							mortgage-				mortgage-		and political
				Corporate			backed		Asset-backed		backed		subdivision
				securities			securities		securities		securities		securities
Fair value, beginning of period				$	974,169	$	81,655	$	193,492	$	115,976	$	10,373
	Total gains/losses (realized/unrealized)
		Included in earnings, net:
			Investment income, net of related expenses		30		110		249		588		(5)
			Investment related gains (losses), net		(585)		279		(670)		(12,075)		(4)
			Claims & other policy benefits		--		--		--		--		--
			Interest credited		--		--		--		--		--
			Policy acquisition costs and other insurance expenses		--		--		--		--		--
		Included in other comprehensive income			(682)		1,580		6,696		13,521		406
	Purchases ⁽¹⁾				21,161		244		--		--		--
	Sales⁽¹⁾				(9,408)		(8,004)		--		--		--
	Settlements⁽¹⁾				(20,875)		(1,800)		(3,865)		--		(23)
	Transfers into Level 3				17,444		--		1,080		10,846		--
	Transfers out of Level 3				(3,583)		(19,629)		(50,620)		(10,178)		(5,508)
Fair value, end of period				$	977,671	$	54,435	$	146,362	$	118,678	$	5,239

Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
		Included in earnings, net:
			Investment income, net of related expenses	$	30	$	106	$	249	$	588	$	(5)
			Investment related gains (losses), net		(727)		(108)		(607)		(12,075)		--
			Claims & other policy benefits		--		--		--		--		--
			Interest credited		--		--		--		--		--
			Policy acquisition costs and other insurance expenses		--		--		--		--		--

For the three months ended March 31, 2012 (continued):				Funds withheld				Reinsurance		Interest sensitive
				at interest-		Other invested		ceded receivable-		contract liabilities
				embedded		assets- other		embedded		embedded
				derivatives		equity securities		derivatives		derivatives
Fair value, beginning of period				$	(361,456)	$	11,489	$	4,945	$	(1,028,241)
	Total gains/losses (realized/unrealized)
		Included in earnings, net:
			Investment income, net of related expenses		--		--		--		--
			Investment related gains (losses), net		(9,428)		--		--		146,375
			Claims & other policy benefits		--		--		--		2,278
			Interest credited		--		--		--		(21,193)
			Policy acquisition costs and other insurance expenses		--		--		(1,329)		--
		Included in other comprehensive income			--		338		--		--
	Purchases⁽¹⁾				--		--		--		(23,590)
	Sales⁽¹⁾				--		--		--		--
	Settlements⁽¹⁾				--		--		(102)		21,089
	Transfers into Level 3				--		--		--		--
	Transfers out of Level 3				--		--		--		--
Fair value, end of period				$	(370,884)	$	11,827	$	3,514	$	(903,282)

Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
		Included in earnings, net:
			Investment income, net of related expenses	$	--	$	--	$	--	$	--
			Investment related gains (losses), net		(9,428)		--		--		144,624
			Claims & other policy benefits		--		--		--		2,037
			Interest credited		--		--		--		(42,107)
			Policy acquisition costs and other insurance expenses		--		--		(1,188)		--

(1)			The amount reported within purchases, sales and settlements is the purchase price (for purchases) and the sales/settlement proceeds (for sales and settlements) based upon the actual date purchased or sold/settled. Items purchased and sold/settled in the same period are excluded from the rollforward. The Company had no issuances during the period.

Nonrecurring Fair Value Measurements

Certain assets are measured at estimated fair value on a non-recurring basis and are not included in the tables presented above. The amounts below relate to certain investments measured at estimated fair value during the period and still held at the reporting dates (dollars in thousands).

		Three months ended March 31,
		2013						2012
		Carrying Value		Estimated Fair		Net		Carrying Value		Estimated Fair		Net
		Prior to		Value After		Investment		Prior to		Value After		Investment
		Measurement		Measurement		Gains (Losses)		Measurement		Measurement		Gains (Losses)
	Mortgage loans⁽¹⁾	$	13,581	$	13,700	$	119	$	32,671	$	28,875	$	(3,796)
	Limited partnership interests⁽²⁾		11,590		9,161		(2,429)		--		--		--

(1)	Mortgage loans — The impaired mortgage loans presented above were written down to their estimated fair values at the date the impairments were recognized and are reported as losses above. Subsequent improvements in estimated fair value on previously impaired loans recorded through a reduction in the previously established valuation allowance are reported as gains above. Nonrecurring fair value adjustments on mortgage loans are based on the fair value of underlying collateral or discounted cash flows and were classified as Level 3 in the fair value hierarchy.
(2)	Limited partnership interests — The impaired investments presented above were accounted for using the cost method. Impairments on these cost method investments were recognized at estimated fair value determined using the net asset values of the Company's ownership interest as provided in the financial statements of the investees. The valuation of these investments is considered Level 3 in the fair value hierarchy due to the limited activity and price transparency inherent in the market for such investments.

Fair Value of Financial Instruments

The Company is required by general accounting principles for Fair Value Measurements and Disclosures to disclose the fair value of certain financial instruments including those that are not carried at fair value. The following table presents the carrying amounts and estimated fair values of the Company's financial instruments, which were not measured at fair value on a recurring basis, at March 31, 2013 and December 31, 2012 (dollars in thousands):

March 31, 2013					Estimated Fair	Fair Value Measurement Using:
			Carrying Value		Value		Level 1	Level 2		Level 3
Assets:
	Mortgage loans on real estate	$	2,325,191	$	2,429,358	$	--	$	--	$	2,429,358
	Policy loans		1,245,812		1,245,812		--		1,245,812		--
	Funds withheld at interest⁽¹⁾		5,851,967		6,363,220		--		--		6,363,220
	Cash and cash equivalents⁽²⁾		633,965		633,965		633,965		--		--
	Short-term investments⁽²⁾		23,426		23,426		23,426		--		--
	Other invested assets⁽²⁾		552,420		589,979		--		32,250		557,729
	Accrued investment income		230,269		230,269		--		230,269		--
Liabilities:
	Interest-sensitive contract liabilities⁽¹⁾	$	11,385,069	$	11,805,623	$	--	$	--	$	11,805,623
	Long-term debt		1,815,392		2,025,511		--		--		2,025,511
	Collateral finance facility		491,987		368,625		--		--		368,625

December 31, 2012:						Estimated Fair	Fair Value Measurement Using:
				Carrying Value	Value			Level 1	Level 2		Level 3
Assets:
	Mortgage loans on real estate		$	2,300,587	$	2,426,688	$	--	$	--	$	2,426,688
	Policy loans			1,278,175		1,278,175		--		1,278,175		--
	Funds withheld at interest⁽¹⁾			5,837,359		6,362,324		--		--		6,362,324
	Cash and cash equivalents⁽²⁾			684,028		684,028		684,028		--		--
	Short-term investments⁽²⁾			48,951		48,951		48,951		--		--
	Other invested assets⁽²⁾			596,336		626,358		--		32,250		594,108
	Accrued investment income			201,344		201,344		--		201,344		--
Liabilities:
	Interest-sensitive contract liabilities⁽¹⁾		$	11,566,962	$	11,926,339	$	--	$	--	$	11,926,339
	Long-term debt			1,815,253		2,014,062		--		--		2,014,062
	Collateral finance facility			652,010		456,050		--		--		456,050

(1)		Carrying values presented herein differ from those presented in the condensed consolidated balance sheets because certain items within the respective financial statement caption are embedded derivatives and are measured at fair value on a recurring basis.

(2)		Carrying values presented herein differ from those presented in the condensed consolidated balance sheets because certain items within the respective financial statement caption are measured at fair value on a recurring basis.

Mortgage Loans on Real Estate – The fair value of mortgage loans on real estate is estimated by discounting cash flows, both principal and interest, using current interest rates for mortgage loans with similar credit ratings and similar remaining maturities. As such, inputs include current treasury yields and spreads, which are based on the credit rating and average life of the loan, corresponding to the market spreads. The valuation of mortgage loans on real estate is considered Level 3 in the fair value hierarchy.

Policy Loans – Policy loans typically carry an interest rate that is adjusted annually based on an observable market index and therefore carrying value approximates fair value. The valuation of policy loans is considered Level 2 in the fair value hierarchy.

Funds Withheld at Interest – The carrying value of funds withheld at interest approximates fair value except where the funds withheld are specifically identified in the agreement. When funds withheld are specifically identified in the agreement, the fair value is based on the fair value of the underlying assets which are held by the ceding company. Ceding companies use a variety of sources and pricing methodologies, which are not transparent to the Company and may include significant unobservable inputs, to value the securities that are held in distinct portfolios, therefore the valuation of these funds withheld assets are considered Level 3 in the fair value hierarchy.

Cash and Cash Equivalents and Short-term Investments – The carrying values of cash and cash equivalents and short-term investments approximates fair values due to the short-term maturities of these instruments and are considered Level 1 in the fair value hierarchy.

Other Invested Assets – This primarily includes limited partnership interests accounted for using the cost method, structured loans and Federal Home Loan Bank of Des Moines common stock. The fair value of limited partnerships and other investments accounted for using the cost method is determined using the net asset values of the Company's ownership interest as provided in the financial statements of the investees. The valuation of these investments is considered Level 3 in the fair value hierarchy due to the limited activity and price transparency inherent in the market for such investments. The fair value of structured loans is estimated based on a discounted cash flow analysis using discount rates applicable to each structured loan, this is considered Level 3 in the fair value hierarchy. The fair value of the Company's common stock investment in the Federal Home Loan Bank of Des Moines is considered to be the carrying value and it is considered Level 2 in the fair value hierarchy.

Accrued Investment Income – The carrying value for accrued investment income approximates fair value as there are no adjustments made to the carrying value. This is considered Level 2 in the fair value hierarchy.

Interest-Sensitive Contract Liabilities – The carrying and fair values of interest-sensitive contract liabilities reflected in the table above exclude contracts with significant mortality risk. The fair value of the Company's interest-sensitive contract liabilities utilizes a market standard technique with both capital market inputs and policyholder behavior assumptions, as well as cash values adjusted for recapture fees. The capital market inputs to the model, such as interest rates, are generally observable. Policyholder behavior assumptions are generally not observable and may require use of significant management judgment. The valuation of interest-sensitive contract liabilities is considered Level 3 in the fair value hierarchy.

Long-term Debt and Collateral Finance Facility – The fair value of the Company's long-term debt and collateral finance facility is generally estimated by discounting future cash flows using market rates currently available for debt with similar remaining maturities and reflecting the credit risk of the Company, including inputs when available, from actively traded debt of the Company or other companies with similar credit quality. The valuation of long-term debt and collateral finance facility are generally obtained from brokers and are considered Level 3 in the fair value hierarchy.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44A, 44B
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15C, 15D
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15A
-Subparagraph a-d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15B
-Subparagraph a, b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 3, 10, 14, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32, 33, 34
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
-Paragraph 17-22, 27, 28
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13537-108611

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13504-108611

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19296-110258

+ Details

Investments (Details 10) - USD ($)	3 Months Ended
Investments (Details 10) - USD ($)	Mar. 31, 2013	Mar. 31, 2012
Investment Gains And Losses [Abstract]
Other-than-temporary impairments on fixed maturity securities	$ 202,000	$ 7,607,000
Portion of loss recognized in accumulated other comprehensive income (before taxes)	0	(7,221,000)
Net other-than-temporary impairment losses on fixed maturities recognized in earnings	202,000	14,828,000
Impairment Losses On Equity Securities	0	(839,000)
Gain on investment activity	21,680,000	22,312,000
Loss on investment activity	(11,212,000)	(7,504,000)
Other impairment losses	(1,626,000)	(5,843,000)
Derivatives And Other Investments Net	85,731,000	50,222,000
Net gains (losses)	$ 94,371,000	$ 43,520,000

Segment Information (Details 2) - USD ($)	Mar. 31, 2013	Dec. 31, 2012
Segment Total Assets [Line Items]
Total assets	$ 40,197,101,000	$ 40,360,438,000
US Segment Reporting Information [Member]
Segment Total Assets [Line Items]
Total assets	24,802,143,000	24,924,363,000
Canada Segment Reporting Information [Member]
Segment Total Assets [Line Items]
Total assets	3,946,500,000	3,764,002,000
Europe And South Africa Segment Reporting Information [Member]
Segment Total Assets [Line Items]
Total assets	2,137,397,000	2,235,199,000
Asia Pacific Segment Reporting Information [Member]
Segment Total Assets [Line Items]
Total assets	3,051,842,000	3,208,732,000
Corporate And Other Segment Reporting Information [Member]
Segment Total Assets [Line Items]
Total assets	$ 6,259,219,000	$ 6,228,142,000

Fair Value Disclosures (Narrative Details)	Mar. 31, 2013	Dec. 31, 2012
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Percentage Of Fixed Maturity Securities Classified As Level 3	10.40%	10.00%