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Derivative Instruments (Details 5) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Income Affect Of Non Hedging Derivatives [Line Items]        
Total investment related gains (losses), net $ 48,243 $ 23,801 $ 142,614 $ 67,321
Policy acquisition costs and other insurance expenses (370,505) (335,939) (727,862) (643,573)
Interest credited (118,345) (66,697) (243,828) (154,739)
Not Designated as Hedging Instrument
        
Income Affect Of Non Hedging Derivatives [Line Items]        
Total investment related gains (losses), net 3,128 29,829 51,293 53,696
Not Designated as Hedging Instrument | Interest Rate Swaps
        
Income Affect Of Non Hedging Derivatives [Line Items]        
Total investment related gains (losses), net (38,415) 73,342 (60,679) 25,990
Not Designated as Hedging Instrument | Interest Rate Options
        
Income Affect Of Non Hedging Derivatives [Line Items]        
Total investment related gains (losses), net (7,981) 0 (5,998) 0
Not Designated as Hedging Instrument | Financial Futures
        
Income Affect Of Non Hedging Derivatives [Line Items]        
Total investment related gains (losses), net 714 11,074 (6,167) (6,335)
Not Designated as Hedging Instrument | Foreign Currency Forwards
        
Income Affect Of Non Hedging Derivatives [Line Items]        
Total investment related gains (losses), net (2,958) 516 (8,617) (1,093)
Not Designated as Hedging Instrument | Consumer Price Index Swaps
        
Income Affect Of Non Hedging Derivatives [Line Items]        
Total investment related gains (losses), net (1,117) (1,431) (1,988) (2,233)
Not Designated as Hedging Instrument | Credit Default Swaps
        
Income Affect Of Non Hedging Derivatives [Line Items]        
Total investment related gains (losses), net 2,427 (4,795) 6,332 7,019
Not Designated as Hedging Instrument | Equity Options
        
Income Affect Of Non Hedging Derivatives [Line Items]        
Total investment related gains (losses), net (5,049) 3,367 (35,672) (34,616)
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 47,717 (4,453) 137,974 (13,881)
Not Designated as Hedging Instrument | Embedded Derivatives In Indexed Annuity Products
        
Income Affect Of Non Hedging Derivatives [Line Items]        
Policy acquisition costs and other insurance expenses 0 859 0 (139)
Interest credited (28,019) 26,279 (61,015) 7,538
Not Designated as Hedging Instrument | Embedded Derivatives In Variable Annuity Products
        
Income Affect Of Non Hedging Derivatives [Line Items]        
Total investment related gains (losses), net $ 35,809 $ (74,929) $ 87,123 $ 71,446