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Derivative Instruments (Non Hedging Derivatives and Embedded Derivatives Effect on Income Statement) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income Affect Of Non Hedging Derivatives [Line Items]        
Total investment related gains (losses), net $ 56,295 $ 118,264 $ 116,818 $ (2,622)
Policy acquisition costs and other insurance expenses (319,832) (405,681) (699,221) (639,444)
Interest credited (115,285) (95,849) (222,969) (183,754)
Other revenues 73,992 66,193 142,149 125,376
Gain Loss On Investments Related To Change In Fair Value Of Derivatives Excluding Embedded Derivatives 3,684 40,733 (19,164) 94,835
Not Designated as Hedging Instrument        
Income Affect Of Non Hedging Derivatives [Line Items]        
Total investment related gains (losses), net 13,197 87,543 65,012 (12,151)
Not Designated as Hedging Instrument | Interest Rate Swap [Member]        
Income Affect Of Non Hedging Derivatives [Line Items]        
Total investment related gains (losses), net 14,289 41,500 11,677 104,027
Not Designated as Hedging Instrument | Financial Futures        
Income Affect Of Non Hedging Derivatives [Line Items]        
Total investment related gains (losses), net (6,442) (7,557) (19,217) (18,608)
Not Designated as Hedging Instrument | Foreign Currency Forwards        
Income Affect Of Non Hedging Derivatives [Line Items]        
Total investment related gains (losses), net (351) 3,577 553 6,077
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) (520) (9) (700)
Not Designated as Hedging Instrument | Credit Default Swaps        
Income Affect Of Non Hedging Derivatives [Line Items]        
Total investment related gains (losses), net 3,879 3,518 11,237 6,864
Not Designated as Hedging Instrument | Equity Options        
Income Affect Of Non Hedging Derivatives [Line Items]        
Total investment related gains (losses), net (9,273) (3,225) (26,462) (5,928)
Not Designated as Hedging Instrument | Longevity Swap [Member]        
Income Affect Of Non Hedging Derivatives [Line Items]        
Other revenues 1,981 2,394 3,847 2,481
Not Designated as Hedging Instrument | Mortality Swap [Member]        
Income Affect Of Non Hedging Derivatives [Line Items]        
Other revenues (395) 1,046 (790) 622
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 15,108 76,966 83,810 (15,283)
Not Designated as Hedging Instrument | Embedded Derivatives In Indexed Annuity [Member]        
Income Affect Of Non Hedging Derivatives [Line Items]        
Interest credited (5,955) (2,019) (22,357) (626)
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 $ 360 $ (28,137) $ 22,723 $ (91,077)