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Derivative Instruments (Details) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Derivative Instruments [Line Items]
Notional Amount	$ 6,525,455,000	$ 4,989,001,000
Carrying Value / Fair Value of Assets	394,703,000	286,951,000
Carrying Value / Fair Value of Liabilities	1,485,610,000	1,444,304,000
Designated As Hedging [Member]
Derivative Instruments [Line Items]
Notional Amount	686,693,000	677,828,000
Carrying Value / Fair Value of Assets	3,901,000	419,000
Carrying Value / Fair Value of Liabilities	32,757,000	24,956,000
Designated As Hedging [Member] | Interest Rate Swap Member
Derivative Instruments [Line Items]
Notional Amount	57,181,000	56,250,000
Carrying Value / Fair Value of Assets	3,901,000	133,000
Carrying Value / Fair Value of Liabilities	0	960,000
Designated As Hedging [Member] | Foreign Exchange Forward Member
Derivative Instruments [Line Items]
Notional Amount	629,512,000	621,578,000
Carrying Value / Fair Value of Assets	0	286,000
Carrying Value / Fair Value of Liabilities	32,757,000	23,996,000
Designated As Non Hedging [Member]
Derivative Instruments [Line Items]
Notional Amount	5,838,762,000	4,311,173,000
Carrying Value / Fair Value of Assets	390,802,000	286,532,000
Carrying Value / Fair Value of Liabilities	1,452,853,000	1,419,348,000
Designated As Non Hedging [Member] | Interest Rate Swap Member
Derivative Instruments [Line Items]
Notional Amount	2,236,718,000	2,748,317,000
Carrying Value / Fair Value of Assets	306,774,000	184,842,000
Carrying Value / Fair Value of Liabilities	174,741,000	18,702,000
Designated As Non Hedging [Member] | Future Member
Derivative Instruments [Line Items]
Notional Amount	204,424,000	277,814,000
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	44,400,000	24,400,000
Carrying Value / Fair Value of Assets	4,052,000	4,560,000
Carrying Value / Fair Value of Liabilities	36,000	0
Designated As Non Hedging [Member] | Consumer Price Index Swap [Member]
Derivative Instruments [Line Items]
Notional Amount	102,742,000	101,069,000
Carrying Value / Fair Value of Assets	817,000	766,000
Carrying Value / Fair Value of Liabilities	0	0
Designated As Non Hedging [Member] | Credit Default Swap Member
Derivative Instruments [Line Items]
Notional Amount	640,500,000	649,500,000
Carrying Value / Fair Value of Assets	1,308,000	1,313,000
Carrying Value / Fair Value of Liabilities	3,770,000	10,949,000
Designated As Non Hedging [Member] | Equity Member
Derivative Instruments [Line Items]
Notional Amount	696,776,000	510,073,000
Carrying Value / Fair Value of Assets	73,659,000	90,106,000
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	320,501,000	361,456,000
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	4,192,000	4,945,000
Carrying Value / Fair Value of Liabilities	751,112,000	751,523,000
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	202,693,000	276,718,000
Designated As Non Hedging [Member] | Synthetic Guaranteed Investment Contracts [Member]
Derivative Instruments [Line Items]
Notional Amount	1,913,202,000	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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