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Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Derivative [Line Items] |  |
Notional Amount of Derivatives | $ 8,943,979 | $ 6,598,107
Derivative Asset, Fair Value, Gross Asset | 101,352 | 190,634
Derivative Liability, Fair Value, Gross Liability | 1,087,331 | 1,209,616
Not Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 8,166,174 | 5,911,320
Derivative Asset, Fair Value, Gross Asset | 79,449 | 190,290
Derivative Liability, Fair Value, Gross Liability | 1,082,105 | 1,181,432
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 1,592,943 | 2,195,059
Derivative Asset, Fair Value, Gross Asset | 32,555 | 123,085
Derivative Liability, Fair Value, Gross Liability | 21,873 | 17,867
Not Designated as Hedging Instrument [Member] | Interest Rate Options [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 240,000 | 0
Derivative Asset, Fair Value, Gross Asset | 2,554 | 0
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Not Designated as Hedging Instrument [Member] | Future [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 123,780 | 127,877
Derivative Asset, Fair Value, Gross Asset | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 79,618 | 74,400
Derivative Asset, Fair Value, Gross Asset | 0 | 1,017
Derivative Liability, Fair Value, Gross Liability | 12,772 | 2,105
Not Designated as Hedging Instrument [Member] | Consumer Price Index Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 59,922 | 85,135
Derivative Asset, Fair Value, Gross Asset | 0 | 1,446
Derivative Liability, Fair Value, Gross Liability | 309 | 0
Not Designated as Hedging Instrument [Member] | Credit Default Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 682,700 | 714,000
Derivative Asset, Fair Value, Gross Asset | 10,438 | 2,228
Derivative Liability, Fair Value, Gross Liability | 2,156 | 5,922
Not Designated as Hedging Instrument [Member] | Equity [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 757,352 | 696,776
Derivative Asset, Fair Value, Gross Asset | 33,902 | 62,514
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Not Designated as Hedging Instrument [Member] | Synthetic Guaranteed Investment Contracts [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 4,629,859 | 2,018,073
Derivative Asset, Fair Value, Gross Asset | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Not Designated as Hedging Instrument [Member] | Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 0 | 0
Derivative Asset, Fair Value, Gross Asset | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 176,270 | 243,177
Not Designated as Hedging Instrument [Member] | Embedded Derivatives In Indexed Annuity [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 0 | 0
Derivative Asset, Fair Value, Gross Asset | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 838,670 | 740,256
Not Designated as Hedging Instrument [Member] | Embedded Derivatives In Variable Annuity [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 0 | 0
Derivative Asset, Fair Value, Gross Asset | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 30,055 | 172,105
Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 777,805 | 686,787
Derivative Asset, Fair Value, Gross Asset | 21,903 | 344
Derivative Liability, Fair Value, Gross Liability | 5,226 | 28,184
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 49,131 | 57,275
Derivative Asset, Fair Value, Gross Asset | 0 | 344
Derivative Liability, Fair Value, Gross Liability | 4,606 | 786
Designated as Hedging Instrument [Member] | Currency Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 728,674 | 629,512
Derivative Asset, Fair Value, Gross Asset | 21,903 | 0
Derivative Liability, Fair Value, Gross Liability | $ 620 | $ 27,398

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