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Derivative Instruments (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Derivative Instruments [Line Items] |  |
Notional Amount | $ 7,726,973 | $ 6,598,107
Carrying Value / Fair Value of Assets | 146,572 | 190,634
Carrying Value / Fair Value of Liabilities | 1,027,941 | 1,209,616
Not Designated as Hedging Instrument |  |
Derivative Instruments [Line Items] |  |
Notional Amount | 6,946,734 | 5,911,320
Carrying Value / Fair Value of Assets | 128,274 | 190,290
Carrying Value / Fair Value of Liabilities | 1,020,385 | 1,181,432
Not Designated as Hedging Instrument | Interest Rate Swaps |  |
Derivative Instruments [Line Items] |  |
Notional Amount | 1,531,811 | 2,195,059
Carrying Value / Fair Value of Assets | 54,742 | 123,085
Carrying Value / Fair Value of Liabilities | 16,971 | 17,867
Not Designated as Hedging Instrument | Interest Rate Options |  |
Derivative Instruments [Line Items] |  |
Notional Amount | 240,000 | 0
Carrying Value / Fair Value of Assets | 8,073 | 0
Carrying Value / Fair Value of Liabilities | 0 | 0
Not Designated as Hedging Instrument | Financial Futures |  |
Derivative Instruments [Line Items] |  |
Notional Amount | 110,328 | 127,877
Carrying Value / Fair Value of Assets | 0 | 0
Carrying Value / Fair Value of Liabilities | 0 | 0
Not Designated as Hedging Instrument | Foreign Currency Forwards |  |
Derivative Instruments [Line Items] |  |
Notional Amount | 83,387 | 74,400
Carrying Value / Fair Value of Assets | 148 | 1,017
Carrying Value / Fair Value of Liabilities | 9,484 | 2,105
Not Designated as Hedging Instrument | Consumer Price Index Swaps |  |
Derivative Instruments [Line Items] |  |
Notional Amount | 74,840 | 85,135
Carrying Value / Fair Value of Assets | 234 | 1,446
Carrying Value / Fair Value of Liabilities | 257 | 0
Not Designated as Hedging Instrument | Credit Default Swaps |  |
Derivative Instruments [Line Items] |  |
Notional Amount | 709,700 | 714,000
Carrying Value / Fair Value of Assets | 3,975 | 2,228
Carrying Value / Fair Value of Liabilities | 6,632 | 5,922
Not Designated as Hedging Instrument | Equity Options |  |
Derivative Instruments [Line Items] |  |
Notional Amount | 727,641 | 696,776
Carrying Value / Fair Value of Assets | 61,102 | 62,514
Carrying Value / Fair Value of Liabilities | 0 | 0
Not Designated as Hedging Instrument | Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements |  |
Derivative Instruments [Line Items] |  |
Notional Amount | 0 | 0
Carrying Value / Fair Value of Assets | 0 | 0
Carrying Value / Fair Value of Liabilities | 108,473 | 243,177
Not Designated as Hedging Instrument | Embedded Derivatives In Indexed Annuity Products |  |
Derivative Instruments [Line Items] |  |
Notional Amount | 0 | 0
Carrying Value / Fair Value of Assets | 0 | 0
Carrying Value / Fair Value of Liabilities | 793,586 | 740,256
Not Designated as Hedging Instrument | Embedded Derivatives In Variable Annuity Products |  |
Derivative Instruments [Line Items] |  |
Notional Amount | 0 | 0
Carrying Value / Fair Value of Assets | 0 | 0
Carrying Value / Fair Value of Liabilities | 84,982 | 172,105
Not Designated as Hedging Instrument | Synthetic Guaranteed Investment Contracts |  |
Derivative Instruments [Line Items] |  |
Notional Amount | 3,469,027 | 2,018,073
Carrying Value / Fair Value of Assets | 0 | 0
Carrying Value / Fair Value of Liabilities | 0 | 0
Designated As Hedging Instrument |  |
Derivative Instruments [Line Items] |  |
Notional Amount | 780,239 | 686,787
Carrying Value / Fair Value of Assets | 18,298 | 344
Carrying Value / Fair Value of Liabilities | 7,556 | 28,184
Designated As Hedging Instrument | Interest Rate Swaps |  |
Derivative Instruments [Line Items] |  |
Notional Amount | 50,349 | 57,275
Carrying Value / Fair Value of Assets | 0 | 344
Carrying Value / Fair Value of Liabilities | 5,058 | 786
Designated As Hedging Instrument | Foreign Currency Swaps |  |
Derivative Instruments [Line Items] |  |
Notional Amount | 729,890 | 629,512
Carrying Value / Fair Value of Assets | 18,298 | 0
Carrying Value / Fair Value of Liabilities | $ 2,498 | $ 27,398

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226000-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 3: 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=7476318&loc=SL5624163-113959 + Details
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