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Derivative Instruments (Details 4) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Income Affect Of Non Hedging Derivatives [Line Items]    
Total investment related gains (losses), net $ 94,371,000 $ 43,520,000
Policy Acquisition Costs And Other Insurance Expenses 357,357,000 307,634,000
Interest credited 125,483,000 88,042,000
Interest Rate Swap Member
    
Income Affect Of Non Hedging Derivatives [Line Items]    
Total investment related gains (losses), net (22,265,000) (47,352,000)
Future Member
    
Income Affect Of Non Hedging Derivatives [Line Items]    
Total investment related gains (losses), net (6,881,000) (17,409,000)
Foreign Exchange Forward Member
    
Income Affect Of Non Hedging Derivatives [Line Items]    
Total investment related gains (losses), net (5,659,000) (1,608,000)
Consumer Price Index Swap [Member]
    
Income Affect Of Non Hedging Derivatives [Line Items]    
Total investment related gains (losses), net (871,000) (802,000)
Credit Default Swap Member
    
Income Affect Of Non Hedging Derivatives [Line Items]    
Total investment related gains (losses), net 3,904,000 11,813,000
Equity Member
    
Income Affect Of Non Hedging Derivatives [Line Items]    
Total investment related gains (losses), net (30,623,000) (37,983,000)
Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements [Member]
    
Income Affect Of Non Hedging Derivatives [Line Items]    
Total investment related gains (losses), net 90,257,000 (9,428,000)
Embedded Derivatives In Indexed Annuity [Member]
    
Income Affect Of Non Hedging Derivatives [Line Items]    
Policy Acquisition Costs And Other Insurance Expenses 0 (998,000)
Interest credited (32,996,000) (18,741,000)
Embedded Derivatives In Variable Annuity [Member]
    
Income Affect Of Non Hedging Derivatives [Line Items]    
Total investment related gains (losses), net 51,314,000 146,375,000
Interest Rate Options [Member]
    
Income Affect Of Non Hedging Derivatives [Line Items]    
Total investment related gains (losses), net $ 1,982,000 $ 0