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Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Derivative [Line Items] |  |
Notional Amount of Derivatives | $ 11,928,989 | $ 11,125,976
Derivative Asset, Fair Value, Gross Asset | 301,270 | 260,898
Derivative Liability, Fair Value, Gross Liability | 1,202,203 | 1,141,831
Not Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 10,985,503 | 10,132,552
Derivative Asset, Fair Value, Gross Asset | 155,005 | 188,817
Derivative Liability, Fair Value, Gross Liability | 1,172,217 | 1,109,058
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 1,123,057 | 1,144,661
Derivative Asset, Fair Value, Gross Asset | 85,075 | 93,783
Derivative Liability, Fair Value, Gross Liability | 4,196 | 3,934
Not Designated as Hedging Instrument [Member] | Interest Rate Options [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 0 | 240,000
Derivative Asset, Fair Value, Gross Asset | 0 | 18,195
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Not Designated as Hedging Instrument [Member] | Future [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 420,665 | 275,983
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 | 45,000 | 67,967
Derivative Asset, Fair Value, Gross Asset | 44 | 87
Derivative Liability, Fair Value, Gross Liability | 6,768 | 15,098
Not Designated as Hedging Instrument [Member] | Consumer Price Index Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 28,561 | 41,938
Derivative Asset, Fair Value, Gross Asset | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 292 | 561
Not Designated as Hedging Instrument [Member] | Credit Default Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 897,000 | 805,700
Derivative Asset, Fair Value, Gross Asset | 8,230 | 11,689
Derivative Liability, Fair Value, Gross Liability | 11,053 | 3,502
Not Designated as Hedging Instrument [Member] | Equity [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 453,435 | 555,361
Derivative Asset, Fair Value, Gross Asset | 46,653 | 35,242
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Not Designated as Hedging Instrument [Member] | Longevity Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 868,960 | 450,000
Derivative Asset, Fair Value, Gross Asset | 15,003 | 7,727
Derivative Liability, Fair Value, Gross Liability | 7 | 0
Not Designated as Hedging Instrument [Member] | Mortality Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 50,000 | 50,000
Derivative Asset, Fair Value, Gross Asset | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 2,619 | 797
Not Designated as Hedging Instrument [Member] | Synthetic Guaranteed Investment Contracts [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 7,098,825 | 6,500,942
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 | 22,094
Derivative Liability, Fair Value, Gross Liability | 76,698 | 0
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 | 878,114 | 925,887
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 | 192,470 | 159,279
Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 943,486 | 993,424
Derivative Asset, Fair Value, Gross Asset | 146,265 | 72,081
Derivative Liability, Fair Value, Gross Liability | 29,986 | 32,773
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 120,000 | 120,000
Derivative Asset, Fair Value, Gross Asset | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 29,986 | 18,228
Designated as Hedging Instrument [Member] | Currency Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 823,486 | 676,972
Derivative Asset, Fair Value, Gross Asset | 146,265 | 70,906
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Designated as Hedging Instrument [Member] | Forward Contracts [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 0 | 196,452
Derivative Asset, Fair Value, Gross Asset | 0 | 1,175
Derivative Liability, Fair Value, Gross Liability | $ 0 | $ 14,545

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