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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

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- Definition

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (a),(c)

-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph a

-Clause 1

-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 133

-Paragraph 205G

-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.

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- Definition

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (a),(c)

-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph a

-Clause 1

-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 133

-Paragraph 205G

-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.

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- Definition

Aggregate notional amount of all derivatives. The notional amount relates to a number of currency units, shares, bushels, pounds, or other units specified in a derivative instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

-URI http://asc.fasb.org/extlink&oid=6519104

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