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Derivative Instruments (Non Hedging Derivatives and Embedded Derivatives Effect on Income Statement) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | $ 7,788 | $ (470)
Policy acquisition costs and other insurance expenses | (311,881) | (356,902)
Interest credited | (133,189) | (80,449)
Other revenues | 94,553 | 75,297
Gain Loss On Investments Related To Change In Fair Value Of Derivatives Excluding Embedded Derivatives | (11,123) | (19,475)
Not Designated as Hedging Instrument |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | 8,016 | 34,272
Not Designated as Hedging Instrument | Interest Rate Swaps |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | 23,974 | (26,571)
Not Designated as Hedging Instrument | Financial Futures |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | (22,278) | 129
Not Designated as Hedging Instrument | Currency Swap [Member] |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | 723 | 0
Not Designated as Hedging Instrument | Foreign Currency Forwards |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | 492 | 323
Not Designated as Hedging Instrument | Consumer Price Index Swap [Member] |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | (8,851) | 2,186
Not Designated as Hedging Instrument | Credit Default Swaps |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | 14,500 | (402)
Not Designated as Hedging Instrument | Equity Options |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | (22,684) | 2,593
Not Designated as Hedging Instrument | Longevity Swap [Member] |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Other revenues | 2,143 | 2,267
Not Designated as Hedging Instrument | Mortality Swap [Member] |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Other revenues | 858 | 0
Not Designated as Hedging Instrument | Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | (2,092) | 13,611
Not Designated as Hedging Instrument | Embedded Derivatives In Indexed Annuity [Member] |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Interest credited | (3,070) | (25,351)
Not Designated as Hedging Instrument | Embedded Derivatives In Variable Annuity [Member] |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | $ 18,161 | $ 14,785

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