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Derivative Instruments (Details 5) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Changes In Estimated Fair Value Related To Embedded Derivatives [Line Items]        
Total investment related gains (losses), net $ 76,053,000 $ (139,600,000) $ 143,374,000 $ 11,408,000
Total benefits and expenses 2,247,602,000 1,838,511,000 6,519,675,000 5,910,999,000
Net income 144,475,000 134,602,000 408,904,000 407,466,000
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 54,836,000 (102,574,000) 40,955,000 (1,514,000)
Net income 11,228,000 (22,403,000) 10,563,000 568,000
Embedded Derivatives In Equity Indexed Annuities [Member]
        
Changes In Estimated Fair Value Related To Embedded Derivatives [Line Items]        
Total benefits and expenses (33,821,000) 14,360,000 (26,422,000) (58,987,000)
Net income (22,529,000) 23,002,000 6,465,000 (26,840,000)
Embedded Derivatives In Variable Annuity Contracts [Member]
        
Changes In Estimated Fair Value Related To Embedded Derivatives [Line Items]        
Total investment related gains (losses), net 2,579,000 (260,239,000) 74,025,000 (253,445,000)
Net income $ 1,588,000 $ (25,263,000) $ 494,000 $ (23,876,000)