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Derivative Instruments (Details) (USD $) | Dec. 31, 2012 | Dec. 31, 2011
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Derivative Instruments [Line Items] |  |
Notional Amount of Derivatives | $ 6,598,107,000 | $ 4,989,001,000
Derivative Asset, Fair Value, Gross Asset | 190,634,000 | 286,951,000
Derivative Liability, Fair Value, Gross Liability | 1,209,616,000 | 1,444,304,000
Designated As Hedging [Member] |  |
Derivative Instruments [Line Items] |  |
Notional Amount of Derivatives | 686,787,000 | 677,828,000
Derivative Asset, Fair Value, Gross Asset | 344,000 | 419,000
Derivative Liability, Fair Value, Gross Liability | 28,184,000 | 24,956,000
Designated As Non Hedging [Member] |  |
Derivative Instruments [Line Items] |  |
Notional Amount of Derivatives | 5,911,320,000 | 4,311,173,000
Derivative Asset, Fair Value, Gross Asset | 190,290,000 | 286,532,000
Derivative Liability, Fair Value, Gross Liability | 1,181,432,000 | 1,419,348,000
Interest Rate Swap [Member] | Designated As Hedging [Member] |  |
Derivative Instruments [Line Items] |  |
Notional Amount of Derivatives | 57,275,000 | 56,250,000
Derivative Asset, Fair Value, Gross Asset | 344,000 | 133,000
Derivative Liability, Fair Value, Gross Liability | 786,000 | 960,000
Interest Rate Swap [Member] | Designated As Non Hedging [Member] |  |
Derivative Instruments [Line Items] |  |
Notional Amount of Derivatives | 2,195,059,000 | 2,748,317,000
Derivative Asset, Fair Value, Gross Asset | 123,085,000 | 184,842,000
Derivative Liability, Fair Value, Gross Liability | 17,867,000 | 18,702,000
Future [Member] | Designated As Non Hedging [Member] |  |
Derivative Instruments [Line Items] |  |
Notional Amount of Derivatives | 127,877,000 | 277,814,000
Derivative Asset, Fair Value, Gross Asset | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Foreign Exchange Forward [Member] | Designated As Non Hedging [Member] |  |
Derivative Instruments [Line Items] |  |
Notional Amount of Derivatives | 74,400,000 | 24,400,000
Derivative Asset, Fair Value, Gross Asset | 1,017,000 | 4,560,000
Derivative Liability, Fair Value, Gross Liability | 2,105,000 | 0
Consumer Price Index Swap [Member] | Designated As Non Hedging [Member] |  |
Derivative Instruments [Line Items] |  |
Notional Amount of Derivatives | 85,135,000 | 101,069,000
Derivative Asset, Fair Value, Gross Asset | 1,446,000 | 766,000
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Credit Default Swap [Member] | Designated As Non Hedging [Member] |  |
Derivative Instruments [Line Items] |  |
Notional Amount of Derivatives | 714,000,000 | 649,500,000
Derivative Asset, Fair Value, Gross Asset | 2,228,000 | 1,313,000
Derivative Liability, Fair Value, Gross Liability | 5,922,000 | 10,949,000
Equity [Member] | Designated As Non Hedging [Member] |  |
Derivative Instruments [Line Items] |  |
Notional Amount of Derivatives | 696,776,000 | 510,073,000
Derivative Asset, Fair Value, Gross Asset | 62,514,000 | 90,106,000
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Currency Swap [Member] | Designated As Hedging [Member] |  |
Derivative Instruments [Line Items] |  |
Notional Amount of Derivatives | 629,512,000 | 621,578,000
Derivative Asset, Fair Value, Gross Asset | 0 | 286,000
Derivative Liability, Fair Value, Gross Liability | 27,398,000 | 23,996,000
Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements [Member] | Designated As Non Hedging [Member] |  |
Derivative Instruments [Line Items] |  |
Notional Amount of Derivatives | 0 | 0
Derivative Asset, Fair Value, Gross Asset | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 243,177,000 | 361,456,000
Embedded Derivatives In Indexed Annuity [Member] | Designated As Non Hedging [Member] |  |
Derivative Instruments [Line Items] |  |
Notional Amount of Derivatives | 0 | 0
Derivative Asset, Fair Value, Gross Asset | 0 | 4,945,000
Derivative Liability, Fair Value, Gross Liability | 740,256,000 | 751,523,000
Embedded Derivatives In Variable Annuity [Member] | Designated As Non Hedging [Member] |  |
Derivative Instruments [Line Items] |  |
Notional Amount of Derivatives | 0 | 0
Derivative Asset, Fair Value, Gross Asset | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 172,105,000 | 276,718,000
Synthetic Guaranteed Investment Contracts [Member] | Designated As Non Hedging [Member] |  |
Derivative Instruments [Line Items] |  |
Notional Amount of Derivatives | 2,018,073,000 | 0
Derivative Asset, Fair Value, Gross Asset | 0 | 0
Derivative Liability, Fair Value, Gross Liability | $ 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. + Details
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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. + Details
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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 + Details
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