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Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Derivative [Line Items] |  |
Notional Amount | $ 9,878,160 | $ 8,943,979
Carrying Value / Fair Value of Assets | 215,411 | 101,352
Carrying Value / Fair Value of Liabilities | 1,047,236 | 1,087,331
Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional Amount | 9,075,954 | 8,166,174
Carrying Value / Fair Value of Assets | 163,175 | 79,449
Carrying Value / Fair Value of Liabilities | 1,036,602 | 1,082,105
Not Designated as Hedging Instrument | Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 1,135,243 | 1,592,943
Carrying Value / Fair Value of Assets | 64,064 | 32,555
Carrying Value / Fair Value of Liabilities | 4,933 | 21,873
Not Designated as Hedging Instrument | Interest Rate Options |  |
Derivative [Line Items] |  |
Notional Amount | 240,000 | 240,000
Carrying Value / Fair Value of Assets | 6,705 | 2,554
Carrying Value / Fair Value of Liabilities | 0 | 0
Not Designated as Hedging Instrument | Financial Futures |  |
Derivative [Line Items] |  |
Notional Amount | 215,732 | 123,780
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 [Line Items] |  |
Notional Amount | 40,000 | 79,618
Carrying Value / Fair Value of Assets | 0 | 0
Carrying Value / Fair Value of Liabilities | 10,408 | 12,772
Not Designated as Hedging Instrument | Consumer Price Index Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 58,780 | 59,922
Carrying Value / Fair Value of Assets | 32 | 0
Carrying Value / Fair Value of Liabilities | 133 | 309
Not Designated as Hedging Instrument | Credit Default Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 763,700 | 682,700
Carrying Value / Fair Value of Assets | 10,384 | 10,438
Carrying Value / Fair Value of Liabilities | 2,881 | 2,156
Not Designated as Hedging Instrument | Equity Options |  |
Derivative [Line Items] |  |
Notional Amount | 571,236 | 757,352
Carrying Value / Fair Value of Assets | 40,966 | 33,902
Carrying Value / Fair Value of Liabilities | 0 | 0
Not Designated as Hedging Instrument | Longevity Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount | 350,000 | 0
Carrying Value / Fair Value of Assets | 4,407 | 0
Carrying Value / Fair Value of Liabilities | 0 | 0
Not Designated as Hedging Instrument | Mortality Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount | 50,000 | 0
Carrying Value / Fair Value of Assets | 0 | 0
Carrying Value / Fair Value of Liabilities | 320 | 0
Not Designated as Hedging Instrument | Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements |  |
Derivative [Line Items] |  |
Notional Amount | 0 | 0
Carrying Value / Fair Value of Assets | 36,617 | 0
Carrying Value / Fair Value of Liabilities | 0 | 176,270
Not Designated as Hedging Instrument | Embedded Derivatives In Indexed Annuity [Member] |  |
Derivative [Line Items] |  |
Notional Amount | 0 | 0
Carrying Value / Fair Value of Assets | 0 | 0
Carrying Value / Fair Value of Liabilities | 911,549 | 838,670
Not Designated as Hedging Instrument | Embedded Derivatives In Variable Annuity [Member] |  |
Derivative [Line Items] |  |
Notional Amount | 0 | 0
Carrying Value / Fair Value of Assets | 0 | 0
Carrying Value / Fair Value of Liabilities | 106,378 | 30,055
Not Designated as Hedging Instrument | Synthetic Guaranteed Investment Contracts |  |
Derivative [Line Items] |  |
Notional Amount | 5,651,263 | 4,629,859
Carrying Value / Fair Value of Assets | 0 | 0
Carrying Value / Fair Value of Liabilities | 0 | 0
Designated As Hedging Instrument |  |
Derivative [Line Items] |  |
Notional Amount | 802,206 | 777,805
Carrying Value / Fair Value of Assets | 52,236 | 21,903
Carrying Value / Fair Value of Liabilities | 10,634 | 5,226
Designated As Hedging Instrument | Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 120,000 | 49,131
Carrying Value / Fair Value of Assets | 0 | 0
Carrying Value / Fair Value of Liabilities | 10,634 | 4,606
Designated As Hedging Instrument | Currency Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount | 682,206 | 728,674
Carrying Value / Fair Value of Assets | 52,236 | 21,903
Carrying Value / Fair Value of Liabilities | $ 0 | $ 620

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