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Derivative Instruments (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Derivative Instruments [Line Items]
Notional Amount	$ 6,328,917	$ 4,989,001
Carrying Value / Fair Value of Assets	448,806	286,951
Carrying Value / Fair Value of Liabilities	1,533,933	1,444,304
Designated As Hedging [Member]
Derivative Instruments [Line Items]
Notional Amount	703,118	677,828
Carrying Value / Fair Value of Assets	1,280	419
Carrying Value / Fair Value of Liabilities	23,715	24,956
Designated As Hedging [Member] | Interest Rate Swap Member
Derivative Instruments [Line Items]
Notional Amount	56,465	56,250
Carrying Value / Fair Value of Assets	1,044	133
Carrying Value / Fair Value of Liabilities	325	960
Designated As Hedging [Member] | Foreign Exchange Forward Member
Derivative Instruments [Line Items]
Notional Amount	646,653	621,578
Carrying Value / Fair Value of Assets	236	286
Carrying Value / Fair Value of Liabilities	23,390	23,996
Designated As Non Hedging [Member]
Derivative Instruments [Line Items]
Notional Amount	5,625,799	4,311,173
Carrying Value / Fair Value of Assets	447,526	286,532
Carrying Value / Fair Value of Liabilities	1,510,218	1,419,348
Designated As Non Hedging [Member] | Interest Rate Swap Member
Derivative Instruments [Line Items]
Notional Amount	2,875,588	2,748,317
Carrying Value / Fair Value of Assets	344,157	184,842
Carrying Value / Fair Value of Liabilities	188,142	18,702
Designated As Non Hedging [Member] | Future Member
Derivative Instruments [Line Items]
Notional Amount	245,481	277,814
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	44,400	24,400
Carrying Value / Fair Value of Assets	3,275	4,560
Carrying Value / Fair Value of Liabilities	0	0
Designated As Non Hedging [Member] | Consumer Price Index Swap [Member]
Derivative Instruments [Line Items]
Notional Amount	101,455	101,069
Carrying Value / Fair Value of Assets	388	766
Carrying Value / Fair Value of Liabilities	0	0
Designated As Non Hedging [Member] | Credit Default Swap Member
Derivative Instruments [Line Items]
Notional Amount	644,500	649,500
Carrying Value / Fair Value of Assets	990	1,313
Carrying Value / Fair Value of Liabilities	7,812	10,949
Designated As Non Hedging [Member] | Equity Member
Derivative Instruments [Line Items]
Notional Amount	710,461	510,073
Carrying Value / Fair Value of Assets	94,300	90,106
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	375,337	361,456
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	4,416	4,945
Carrying Value / Fair Value of Liabilities	733,655	751,523
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	205,272	276,718
Designated As Non Hedging [Member] | Synthetic Guaranteed Investment Contracts [Member]
Derivative Instruments [Line Items]
Notional Amount	1,003,914	0
Carrying Value / Fair Value of Assets	0	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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