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Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivative [Line Items] |  |
Notional Amount | $ 20,383,300 | $ 19,884,691
Carrying Value / Fair Value of Assets | 313,532 | 356,666
Derivative Liability, Fair Value, Gross Liability | 956,712 | 990,895
Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional Amount | 18,546,735 | 18,044,033
Carrying Value / Fair Value of Assets | 241,159 | 254,381
Derivative Liability, Fair Value, Gross Liability | 931,797 | 963,638
Not Designated as Hedging Instrument | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount | 1,018,438 | 1,040,588
Carrying Value / Fair Value of Assets | 57,278 | 47,652
Derivative Liability, Fair Value, Gross Liability | 2,670 | 961
Not Designated as Hedging Instrument | Financial Futures |  |
Derivative [Line Items] |  |
Notional Amount | 360,170 | 325,620
Carrying Value / Fair Value of Assets | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Not Designated as Hedging Instrument | Foreign Currency Forwards |  |
Derivative [Line Items] |  |
Notional Amount | 25,000 | 25,000
Carrying Value / Fair Value of Assets | 251 | 0
Derivative Liability, Fair Value, Gross Liability | 0 | 234
Not Designated as Hedging Instrument | Consumer Price Index Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount | 388,151 | 385,580
Carrying Value / Fair Value of Assets | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 20,505 | 11,384
Not Designated as Hedging Instrument | Credit Default Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 1,348,300 | 1,338,300
Carrying Value / Fair Value of Assets | 6,614 | 6,003
Derivative Liability, Fair Value, Gross Liability | 58 | 1,166
Not Designated as Hedging Instrument | Equity Options |  |
Derivative [Line Items] |  |
Notional Amount | 439,158 | 439,158
Carrying Value / Fair Value of Assets | 20,152 | 42,836
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Not Designated as Hedging Instrument | Longevity Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount | 897,440 | 917,360
Carrying Value / Fair Value of Assets | 48,869 | 47,789
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Not Designated as Hedging Instrument | Mortality Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount | 25,000 | 25,000
Carrying Value / Fair Value of Assets | 489 | 0
Derivative Liability, Fair Value, Gross Liability | 0 | 369
Not Designated as Hedging Instrument | Synthetic Guaranteed Investment Contracts |  |
Derivative [Line Items] |  |
Notional Amount | 13,895,380 | 13,397,729
Carrying Value / Fair Value of Assets | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 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 | 107,506 | 109,597
Derivative Liability, Fair Value, Gross Liability | 0 | 0
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
Derivative Liability, Fair Value, Gross Liability | 754,171 | 776,940
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
Derivative Liability, Fair Value, Gross Liability | 149,764 | 167,925
Not Designated as Hedging Instrument | Currency Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount | 149,698 | 149,698
Carrying Value / Fair Value of Assets | 0 | 504
Derivative Liability, Fair Value, Gross Liability | 4,629 | 4,659
Designated As Hedging Instrument |  |
Derivative [Line Items] |  |
Notional Amount | 1,836,565 | 1,840,658
Carrying Value / Fair Value of Assets | 72,373 | 102,285
Derivative Liability, Fair Value, Gross Liability | 24,915 | 27,257
Designated As Hedging Instrument | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount | 435,000 | 435,000
Carrying Value / Fair Value of Assets | 891 | 0
Derivative Liability, Fair Value, Gross Liability | 24,436 | 27,257
Designated As Hedging Instrument | Currency Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount | 451,686 | 494,461
Carrying Value / Fair Value of Assets | 38,620 | 51,311
Derivative Liability, Fair Value, Gross Liability | 479 | 0
Designated As Hedging Instrument | Forward Contracts [Member] |  |
Derivative [Line Items] |  |
Notional Amount | 949,879 | 911,197
Carrying Value / Fair Value of Assets | 32,862 | 50,974
Derivative Liability, Fair Value, Gross Liability | $ 0 | $ 0

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