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Derivative Instruments (Non Hedging Derivatives and Embedded Derivatives Effect on Income Statement) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Affect Of Non Hedging Derivatives [Line Items]    
Total investment related gains (losses), net $ (470) $ 60,523
Policy acquisition costs and other insurance expenses (356,902) (379,389)
Interest credited (80,449) (107,684)
Other revenues 75,297 68,157
Gain Loss On Investments Related To Change In Fair Value Of Derivatives Excluding Embedded Derivatives (19,475) (22,849)
Not Designated as Hedging Instrument    
Income Affect Of Non Hedging Derivatives [Line Items]    
Total investment related gains (losses), net 34,272 51,814
Not Designated as Hedging Instrument | Interest Rate Swaps    
Income Affect Of Non Hedging Derivatives [Line Items]    
Total investment related gains (losses), net (26,571) (2,612)
Not Designated as Hedging Instrument | Financial Futures    
Income Affect Of Non Hedging Derivatives [Line Items]    
Total investment related gains (losses), net 129 (12,775)
Not Designated as Hedging Instrument | Foreign Currency Forwards    
Income Affect Of Non Hedging Derivatives [Line Items]    
Total investment related gains (losses), net 323 904
Not Designated as Hedging Instrument | Consumer Price Index Swap [Member]    
Income Affect Of Non Hedging Derivatives [Line Items]    
Total investment related gains (losses), net 2,186 (5)
Not Designated as Hedging Instrument | Credit Default Swaps    
Income Affect Of Non Hedging Derivatives [Line Items]    
Total investment related gains (losses), net (402) 7,358
Not Designated as Hedging Instrument | Equity Options    
Income Affect Of Non Hedging Derivatives [Line Items]    
Total investment related gains (losses), net 2,593 (17,189)
Not Designated as Hedging Instrument | Longevity Swap [Member]    
Income Affect Of Non Hedging Derivatives [Line Items]    
Other revenues 2,267 1,865
Not Designated as Hedging Instrument | Mortality Swap [Member]    
Income Affect Of Non Hedging Derivatives [Line Items]    
Other revenues 0 (395)
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 13,611 68,702
Not Designated as Hedging Instrument | Embedded Derivatives In Indexed Annuity [Member]    
Income Affect Of Non Hedging Derivatives [Line Items]    
Interest credited (25,351) 16,402
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 $ 14,785 $ 22,363