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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, 2016
Mar. 31, 2015
Income Affect Of Non Hedging Derivatives [Line Items]    
Total investment related gains (losses), net $ (120,886) $ 7,583
Policy acquisition costs and other insurance expenses (233,763) (277,043)
Interest credited (87,905) (120,678)
Other revenues 59,183 62,287
Not Designated as Hedging Instrument    
Income Affect Of Non Hedging Derivatives [Line Items]    
Total investment related gains (losses), net (99,694) (35,854)
Not Designated as Hedging Instrument | Interest Rate Swaps    
Income Affect Of Non Hedging Derivatives [Line Items]    
Total investment related gains (losses), net 62,527 29,344
Not Designated as Hedging Instrument | Interest Rate Options    
Income Affect Of Non Hedging Derivatives [Line Items]    
Total investment related gains (losses), net 0 3,275
Not Designated as Hedging Instrument | Financial Futures    
Income Affect Of Non Hedging Derivatives [Line Items]    
Total investment related gains (losses), net (11,051) (7,331)
Not Designated as Hedging Instrument | Foreign Currency Forwards    
Income Affect Of Non Hedging Derivatives [Line Items]    
Total investment related gains (losses), net 2,500 (220)
Not Designated as Hedging Instrument | Consumer Price Index Swap [Member]    
Income Affect Of Non Hedging Derivatives [Line Items]    
Total investment related gains (losses), net (180) (71)
Not Designated as Hedging Instrument | Credit Default Swaps    
Income Affect Of Non Hedging Derivatives [Line Items]    
Total investment related gains (losses), net 3,346 2,658
Not Designated as Hedging Instrument | Equity Options    
Income Affect Of Non Hedging Derivatives [Line Items]    
Total investment related gains (losses), net (2,703) (8,067)
Not Designated as Hedging Instrument | Longevity Swap [Member]    
Income Affect Of Non Hedging Derivatives [Line Items]    
Other revenues 87 1,821
Not Designated as Hedging Instrument | Mortality Swap [Member]    
Income Affect Of Non Hedging Derivatives [Line Items]    
Other revenues (424) (479)
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 (92,250) (2,325)
Not Designated as Hedging Instrument | Embedded Derivatives In Indexed Annuity [Member]    
Income Affect Of Non Hedging Derivatives [Line Items]    
Interest credited (1,394) (29,326)
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 $ (62,940) $ (25,133)