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Derivative Instruments (Non Hedging Derivatives and Embedded Derivatives Effect on Income Statement) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |  |
Total investment related gains (losses), net | $ (20,017) | $ 22,653 | $ (31,059) | $ 139,471
Policy acquisition costs and other insurance expenses | (310,639) | (365,424) | (987,817) | (1,064,645)
Interest credited | 143,292 | 126,099 | 333,068 | 349,068
Other revenues | 112,764 | 75,942 | 272,020 | 218,091
Gain Loss On Investments Related To Change In Fair Value Of Derivatives Excluding Embedded Derivatives | (25,258) | (8,961) | (58,883) | (28,125)
Not Designated as Hedging Instrument |  |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |  |
Total investment related gains (losses), net | (20,553) | (5,255) | 30,217 | 59,757
Not Designated as Hedging Instrument | Interest Rate Swap [Member] |  |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |  |
Total investment related gains (losses), net | (12,228) | 641 | (47,399) | 12,318
Not Designated as Hedging Instrument | Financial Futures |  |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |  |
Total investment related gains (losses), net | (6,544) | (8,890) | (7,312) | (28,107)
Not Designated as Hedging Instrument | Foreign Currency Forwards |  |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |  |
Total investment related gains (losses), net | (58) | 24 | 3 | 577
Not Designated as Hedging Instrument | Consumer Price Index Swap [Member] |  |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |  |
Total investment related gains (losses), net | (4,223) | 220 | (996) | 211
Not Designated as Hedging Instrument | Credit Default Swaps |  |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |  |
Total investment related gains (losses), net | 4,689 | 4,137 | 5,371 | 15,374
Not Designated as Hedging Instrument | Equity Options |  |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |  |
Total investment related gains (losses), net | (9,793) | (8,295) | (15,207) | (34,757)
Not Designated as Hedging Instrument | Longevity Swap [Member] |  |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |  |
Other revenues | 2,426 | 3,334 | 6,983 | 7,180
Not Designated as Hedging Instrument | Mortality Swap [Member] |  |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |  |
Other revenues | 473 | (132) | (326) | (921)
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 | (2,081) | 23,044 | 20,335 | 106,854
Not Designated as Hedging Instrument | Embedded Derivatives In Indexed Annuity [Member] |  |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |  |
Interest credited | (25,347) | 13,133 | 6,523 | 35,490
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 | $ 32,133 | $ (6,205) | $ 62,242 | $ 16,518

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- Definition This item represents the amount recognized in investment related gains (losses) related to the change in the fair value of derivatives, excluding embedded derivatives. + References No definition available. + Details
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