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Derivative Instruments (Non Hedging Derivatives and Embedded Derivatives Effect on Income Statement) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |
Total investment related gains (losses), net | $ (170,088) | $ 167,880 | $ 94,195
Other revenues | (363,451) | (352,108) | (266,559)
Gain Loss On Investments Related To Change In Fair Value Of Derivatives Excluding Embedded Derivatives | (96) | (42,767) | (28,611)
Interest credited | (425,204) | (502,040) | (364,691)
Not Designated as Hedging Instrument [Member] |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |
Total investment related gains (losses), net | (557) | 54,060 | 44,101
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |
Total investment related gains (losses), net | (21,314) | 11,278 | 7,649
Not Designated as Hedging Instrument [Member] | Future [Member] |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |
Total investment related gains (losses), net | 21,200 | (36,160) | (40,242)
Not Designated as Hedging Instrument [Member] | Currency Swap [Member] |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |
Total investment related gains (losses), net | (3,695) | 0 | 0
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |
Total investment related gains (losses), net | (234) | 591 | 1,630
Not Designated as Hedging Instrument [Member] | Consumer Price Index Swap [Member] |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |
Total investment related gains (losses), net | (10,047) | (2,078) | (401)
Not Designated as Hedging Instrument [Member] | Credit Default Swap [Member] |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |
Total investment related gains (losses), net | (2,150) | 18,118 | 18,100
Not Designated as Hedging Instrument [Member] | Equity [Member] |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |
Total investment related gains (losses), net | 7,315 | (42,953) | (28,270)
Not Designated as Hedging Instrument [Member] | Longevity Swap [Member] |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |
Other revenues | (9,215) | (9,358) | (13,095)
Not Designated as Hedging Instrument [Member] | Mortality Swap [Member] |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |
Other revenues | (386) | (921) | (172)
Not Designated as Hedging Instrument [Member] | Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements [Member] |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |
Total investment related gains (losses), net | (12,597) | 144,723 | 54,169
Not Designated as Hedging Instrument [Member] | Embedded Derivatives In Indexed Annuity [Member] |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |
Interest credited | (27,591) | (80,062) | (10,708)
Not Designated as Hedging Instrument [Member] | Embedded Derivatives In Variable Annuity [Member] |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |
Total investment related gains (losses), net | $ (15,455) | $ 32,166 | $ 7,835

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