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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, 2017
Mar. 31, 2016
Income Affect Of Non Hedging Derivatives [Line Items]    
Total investment related gains (losses), net $ 60,523 $ (120,886)
Policy acquisition costs and other insurance expenses (379,389) (233,763)
Interest credited (107,684) (87,905)
Other revenues 68,157 59,183
Not Designated as Hedging Instrument    
Income Affect Of Non Hedging Derivatives [Line Items]    
Total investment related gains (losses), net 51,814 (99,694)
Not Designated as Hedging Instrument | Interest Rate Swaps    
Income Affect Of Non Hedging Derivatives [Line Items]    
Total investment related gains (losses), net (2,612) 62,527
Not Designated as Hedging Instrument | Financial Futures    
Income Affect Of Non Hedging Derivatives [Line Items]    
Total investment related gains (losses), net (12,775) (11,051)
Not Designated as Hedging Instrument | Foreign Currency Forwards    
Income Affect Of Non Hedging Derivatives [Line Items]    
Total investment related gains (losses), net 904 2,500
Not Designated as Hedging Instrument | Consumer Price Index Swap [Member]    
Income Affect Of Non Hedging Derivatives [Line Items]    
Total investment related gains (losses), net (5) (180)
Not Designated as Hedging Instrument | Credit Default Swaps    
Income Affect Of Non Hedging Derivatives [Line Items]    
Total investment related gains (losses), net 7,358 3,346
Not Designated as Hedging Instrument | Equity Options    
Income Affect Of Non Hedging Derivatives [Line Items]    
Total investment related gains (losses), net (17,189) (2,703)
Not Designated as Hedging Instrument | Longevity Swap [Member]    
Income Affect Of Non Hedging Derivatives [Line Items]    
Other revenues 1,865 87
Not Designated as Hedging Instrument | Mortality Swap [Member]    
Income Affect Of Non Hedging Derivatives [Line Items]    
Other revenues (395) (424)
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 68,702 (92,250)
Not Designated as Hedging Instrument | Embedded Derivatives In Indexed Annuity [Member]    
Income Affect Of Non Hedging Derivatives [Line Items]    
Interest credited 16,402 (1,394)
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 $ 22,363 $ (62,940)