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Derivative Instruments (Details 6) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Changes In Estimated Fair Value Related To Embedded Derivatives [Line Items]    
Total investment related gains (losses), net $ 94,371,000 $ 43,520,000
Total benefits and expenses 2,322,275,000 2,112,212,000
Net income 185,535,000 123,318,000
Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements [Member]
    
Changes In Estimated Fair Value Related To Embedded Derivatives [Line Items]    
Total investment related gains (losses), net 90,257,000 (9,428,000)
Net income 21,624,000 1,933,000
Embedded Derivatives In Equity Indexed Annuities [Member]
    
Changes In Estimated Fair Value Related To Embedded Derivatives [Line Items]    
Total benefits and expenses (32,996,000) (19,739,000)
Net income (29,550,000) 13,870,000
Embedded Derivatives In Variable Annuity Contracts [Member]
    
Changes In Estimated Fair Value Related To Embedded Derivatives [Line Items]    
Total investment related gains (losses), net 51,314,000 146,375,000
Net income $ 12,192,000 $ 15,082,000