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Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Derivative [Line Items] |  |
Notional Amount of Derivatives | $ 19,884,691 | $ 15,904,127
Derivative Asset, Fair Value, Gross Asset | 356,666 | 320,724
Derivative Liability, Fair Value, Gross Liability | 990,895 | 1,058,727
Not Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 18,044,033 | 14,243,031
Derivative Asset, Fair Value, Gross Asset | 254,381 | 254,252
Derivative Liability, Fair Value, Gross Liability | 963,638 | 1,022,122
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 1,040,588 | 996,204
Derivative Asset, Fair Value, Gross Asset | 47,652 | 59,809
Derivative Liability, Fair Value, Gross Liability | 961 | 2,372
Not Designated as Hedging Instrument [Member] | Future [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 325,620 | 412,438
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 | 25,000 | 6,030
Derivative Asset, Fair Value, Gross Asset | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 234 | 28
Not Designated as Hedging Instrument [Member] | Consumer Price Index Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 385,580 | 221,932
Derivative Asset, Fair Value, Gross Asset | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 11,384 | 2,160
Not Designated as Hedging Instrument [Member] | Credit Default Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 1,338,300 | 961,200
Derivative Asset, Fair Value, Gross Asset | 6,003 | 8,319
Derivative Liability, Fair Value, Gross Liability | 1,166 | 1,651
Not Designated as Hedging Instrument [Member] | Equity [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 439,158 | 632,251
Derivative Asset, Fair Value, Gross Asset | 42,836 | 23,271
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Not Designated as Hedging Instrument [Member] | Longevity Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 917,360 | 960,400
Derivative Asset, Fair Value, Gross Asset | 47,789 | 40,659
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Not Designated as Hedging Instrument [Member] | Mortality Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 25,000 | 0
Derivative Asset, Fair Value, Gross Asset | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 369 | 1,683
Not Designated as Hedging Instrument [Member] | Synthetic Guaranteed Investment Contracts [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 13,397,729 | 10,052,576
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 | 109,597 | 122,194
Derivative Liability, Fair Value, Gross Liability | 0 | 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 | 776,940 | 861,758
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 | 167,925 | 152,470
Not Designated as Hedging Instrument [Member] | Currency Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 149,698 | 0
Derivative Asset, Fair Value, Gross Asset | 504 | 0
Derivative Liability, Fair Value, Gross Liability | 4,659 | 0
Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 1,840,658 | 1,661,096
Derivative Asset, Fair Value, Gross Asset | 102,285 | 66,472
Derivative Liability, Fair Value, Gross Liability | 27,257 | 36,605
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 435,000 | 435,000
Derivative Asset, Fair Value, Gross Asset | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 27,257 | 20,389
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 911,197 | 553,175
Derivative Asset, Fair Value, Gross Asset | 50,974 | 1,265
Derivative Liability, Fair Value, Gross Liability | 0 | 7,720
Designated as Hedging Instrument [Member] | Currency Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 494,461 | 672,921
Derivative Asset, Fair Value, Gross Asset | 51,311 | 65,207
Derivative Liability, Fair Value, Gross Liability | $ 0 | $ 8,496

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