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Derivative Instruments (Details 6) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Income Affect Of Non Hedging Derivatives [Line Items]        
Total investment related gains (losses), net $ 76,053,000 $ (139,600,000) $ 143,374,000 $ 11,408,000
Policy Acquisition Costs And Other Insurance Expenses 318,106,000 164,372,000 961,679,000 785,138,000
Interest credited 130,341,000 35,251,000 285,080,000 237,510,000
Interest Rate Swap Member
        
Income Affect Of Non Hedging Derivatives [Line Items]        
Total investment related gains (losses), net (1,437,000) 142,907,000 24,553,000 157,520,000
Future Member
        
Income Affect Of Non Hedging Derivatives [Line Items]        
Total investment related gains (losses), net (3,977,000) 36,217,000 (10,312,000) 21,920,000
Foreign Exchange Forward Member
        
Income Affect Of Non Hedging Derivatives [Line Items]        
Total investment related gains (losses), net 519,000 1,374,000 (574,000) 1,114,000
Consumer Price Index Swap [Member]
        
Income Affect Of Non Hedging Derivatives [Line Items]        
Total investment related gains (losses), net 422,000 (219,000) (1,811,000) 1,096,000
Credit Default Swap Member
        
Income Affect Of Non Hedging Derivatives [Line Items]        
Total investment related gains (losses), net 7,817,000 (10,018,000) 14,835,000 (8,138,000)
Equity Member
        
Income Affect Of Non Hedging Derivatives [Line Items]        
Total investment related gains (losses), net (23,916,000) 30,530,000 (58,532,000) 29,880,000
Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements [Member]
        
Income Affect Of Non Hedging Derivatives [Line Items]        
Total investment related gains (losses), net 54,836,000 (102,574,000) 40,955,000 (1,514,000)
Embedded Derivatives In Indexed Annuity [Member]
        
Income Affect Of Non Hedging Derivatives [Line Items]        
Policy Acquisition Costs And Other Insurance Expenses (224,000) (3,172,000) (363,000) 8,947,000
Interest credited (33,597,000) 17,531,000 (26,059,000) (67,935,000)
Embedded Derivatives In Variable Annuity [Member]
        
Income Affect Of Non Hedging Derivatives [Line Items]        
Total investment related gains (losses), net $ 2,579,000 $ (260,239,000) $ 74,025,000 $ (253,445,000)