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Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Derivative [Line Items] |  |
Notional Amount | $ 8,194,538 | $ 6,598,107
Carrying Value / Fair Value of Assets | 109,819 | 190,634
Carrying Value / Fair Value of Liabilities | 1,037,378 | 1,209,616
Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional Amount | 7,362,929 | 5,911,320
Carrying Value / Fair Value of Assets | 100,475 | 190,290
Carrying Value / Fair Value of Liabilities | 1,030,283 | 1,181,432
Not Designated as Hedging Instrument | Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 1,510,467 | 2,195,059
Carrying Value / Fair Value of Assets | 45,280 | 123,085
Carrying Value / Fair Value of Liabilities | 15,694 | 17,867
Not Designated as Hedging Instrument | Interest Rate Options |  |
Derivative [Line Items] |  |
Notional Amount | 240,000 | 0
Carrying Value / Fair Value of Assets | 5,699 | 0
Carrying Value / Fair Value of Liabilities | 0 | 0
Not Designated as Hedging Instrument | Financial Futures |  |
Derivative [Line Items] |  |
Notional Amount | 84,192 | 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 [Line Items] |  |
Notional Amount | 79,618 | 74,400
Carrying Value / Fair Value of Assets | 0 | 1,017
Carrying Value / Fair Value of Liabilities | 8,928 | 2,105
Not Designated as Hedging Instrument | Consumer Price Index Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 76,306 | 85,135
Carrying Value / Fair Value of Assets | 131 | 1,446
Carrying Value / Fair Value of Liabilities | 19 | 0
Not Designated as Hedging Instrument | Credit Default Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 689,700 | 714,000
Carrying Value / Fair Value of Assets | 5,744 | 2,228
Carrying Value / Fair Value of Liabilities | 3,810 | 5,922
Not Designated as Hedging Instrument | Equity Options |  |
Derivative [Line Items] |  |
Notional Amount | 704,402 | 696,776
Carrying Value / Fair Value of Assets | 43,621 | 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 [Line Items] |  |
Notional Amount | 0 | 0
Carrying Value / Fair Value of Assets | 0 | 0
Carrying Value / Fair Value of Liabilities | 175,933 | 243,177
Not Designated as Hedging Instrument | Embedded Derivatives In Indexed Annuity Products |  |
Derivative [Line Items] |  |
Notional Amount | 0 | 0
Carrying Value / Fair Value of Assets | 0 | 0
Carrying Value / Fair Value of Liabilities | 760,746 | 740,256
Not Designated as Hedging Instrument | Embedded Derivatives In Variable Annuity Products |  |
Derivative [Line Items] |  |
Notional Amount | 0 | 0
Carrying Value / Fair Value of Assets | 0 | 0
Carrying Value / Fair Value of Liabilities | 65,153 | 172,105
Not Designated as Hedging Instrument | Synthetic Guaranteed Investment Contracts |  |
Derivative [Line Items] |  |
Notional Amount | 3,978,244 | 2,018,073
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 | 831,609 | 686,787
Carrying Value / Fair Value of Assets | 9,344 | 344
Carrying Value / Fair Value of Liabilities | 7,095 | 28,184
Designated As Hedging Instrument | Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 51,335 | 57,275
Carrying Value / Fair Value of Assets | 0 | 344
Carrying Value / Fair Value of Liabilities | 2,770 | 786
Designated As Hedging Instrument | Foreign Currency Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 780,274 | 629,512
Carrying Value / Fair Value of Assets | 9,344 | 0
Carrying Value / Fair Value of Liabilities | $ 4,325 | $ 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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