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Fair Value Disclosures (Details 3) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Funds Withheld At Interest Embedded Derivatives [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]    
Balance, Beginning of period $ (243,177,000) $ (361,456,000)
Total gains or (losses) (realized/unrealized)    
Investment income, net of related expenses 0 0
Investment related gains (losses), net 86,988,000 (9,428,000)
Claims and other policy benefits 0 0
Interest credited 0 0
Policy acquisition costs and other insurance expenses 0 0
Included in other comprehensive income 0 0
Purchases 0 0
Sales 0 0
Settlements 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Balance, End of period (156,189,000) (370,884,000)
Unrealized Gains And Losses Recorded In Earnings For The Period Relating To Those Level 3 Assets And Liabilities That Were Still Held At The End Of The Period    
Investment income, net of related expenses 0 0
Investment related gains (losses), net 86,988,000 (9,428,000)
Claims & other policy benefits 0 0
Interest credited 0 0
Policy acquisition costs and other insurance expenses 0 0
Other Debt Securities Member
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]    
Balance, Beginning of period   11,489,000
Total gains or (losses) (realized/unrealized)    
Investment income, net of related expenses   0
Investment related gains (losses), net   0
Claims and other policy benefits   0
Interest credited   0
Policy acquisition costs and other insurance expenses   0
Included in other comprehensive income   338,000
Purchases   0
Sales   0
Settlements   0
Transfers into Level 3   0
Transfers out of Level 3   0
Balance, End of period   11,827,000
Unrealized Gains And Losses Recorded In Earnings For The Period Relating To Those Level 3 Assets And Liabilities That Were Still Held At The End Of The Period    
Investment income, net of related expenses   0
Investment related gains (losses), net   0
Claims & other policy benefits   0
Interest credited   0
Policy acquisition costs and other insurance expenses   0
Reinsurance Ceded Receivable Embedded Derivatives [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]    
Balance, Beginning of period   4,945,000
Total gains or (losses) (realized/unrealized)    
Investment income, net of related expenses   0
Investment related gains (losses), net   0
Claims and other policy benefits   0
Interest credited   0
Policy acquisition costs and other insurance expenses   (1,329,000)
Included in other comprehensive income   0
Purchases   0
Sales   0
Settlements   (102,000)
Transfers into Level 3   0
Transfers out of Level 3   0
Balance, End of period   3,514,000
Unrealized Gains And Losses Recorded In Earnings For The Period Relating To Those Level 3 Assets And Liabilities That Were Still Held At The End Of The Period    
Investment income, net of related expenses   0
Investment related gains (losses), net   0
Claims & other policy benefits   0
Interest credited   0
Policy acquisition costs and other insurance expenses   (1,188,000)
Interest Sensitive Contract Liabilities Embedded Derivatives [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]    
Balance, Beginning of period (912,361,000) (1,028,241,000)
Total gains or (losses) (realized/unrealized)    
Investment income, net of related expenses 0 0
Investment related gains (losses), net 51,314,000 146,375,000
Claims and other policy benefits 0 2,278,000
Interest credited (32,996,000) (21,193,000)
Policy acquisition costs and other insurance expenses 0 0
Included in other comprehensive income 0 0
Purchases (13,860,000) (23,590,000)
Sales 0 0
Settlements 17,427,000 21,089,000
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Balance, End of period (890,476,000) (903,282,000)
Unrealized Gains And Losses Recorded In Earnings For The Period Relating To Those Level 3 Assets And Liabilities That Were Still Held At The End Of The Period    
Investment income, net of related expenses 0 0
Investment related gains (losses), net 50,123,000 144,624,000
Claims & other policy benefits 0 2,037,000
Interest credited (50,424,000) (42,107,000)
Policy acquisition costs and other insurance expenses 0 0
Short Term Investments Member
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]    
Balance, Beginning of period 22,031,000  
Total gains or (losses) (realized/unrealized)    
Investment income, net of related expenses (3,000)  
Investment related gains (losses), net 0  
Claims and other policy benefits 0  
Interest credited 0  
Policy acquisition costs and other insurance expenses 0  
Included in other comprehensive income (27,000)  
Purchases 0  
Sales 0  
Settlements 0  
Transfers into Level 3 0  
Transfers out of Level 3 0  
Balance, End of period 22,001,000  
Unrealized Gains And Losses Recorded In Earnings For The Period Relating To Those Level 3 Assets And Liabilities That Were Still Held At The End Of The Period    
Investment income, net of related expenses (4,000)  
Investment related gains (losses), net 0  
Claims & other policy benefits 0  
Interest credited 0  
Policy acquisition costs and other insurance expenses 0  
Availableforsale Securities Member | Corporate Debt Securities Member
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]    
Balance, Beginning of period 1,668,563,000 974,169,000
Total gains or (losses) (realized/unrealized)    
Investment income, net of related expenses (2,027,000) 30,000
Investment related gains (losses), net (1,262,000) (585,000)
Claims and other policy benefits 0 0
Interest credited 0 0
Policy acquisition costs and other insurance expenses 0 0
Included in other comprehensive income 963,000 (682,000)
Purchases 74,671,000 21,161,000
Sales (16,278,000) (9,408,000)
Settlements (65,366,000) (20,875,000)
Transfers into Level 3 3,773,000 17,444,000
Transfers out of Level 3 (16,134,000) (3,583,000)
Balance, End of period 1,646,903,000 977,671,000
Unrealized Gains And Losses Recorded In Earnings For The Period Relating To Those Level 3 Assets And Liabilities That Were Still Held At The End Of The Period    
Investment income, net of related expenses (2,027,000) 30,000
Investment related gains (losses), net (202,000) (727,000)
Claims & other policy benefits 0 0
Interest credited 0 0
Policy acquisition costs and other insurance expenses 0 0
Availableforsale Securities Member | Residential Mortgage Backed Securities Member
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]    
Balance, Beginning of period 93,931,000 81,655,000
Total gains or (losses) (realized/unrealized)    
Investment income, net of related expenses 105,000 110,000
Investment related gains (losses), net (173,000) 279,000
Claims and other policy benefits 0 0
Interest credited 0 0
Policy acquisition costs and other insurance expenses 0 0
Included in other comprehensive income 2,514,000 1,580,000
Purchases 40,538,000 244,000
Sales (1,599,000) (8,004,000)
Settlements (4,923,000) (1,800,000)
Transfers into Level 3 10,324,000 0
Transfers out of Level 3 0 (19,629,000)
Balance, End of period 140,717,000 54,435,000
Unrealized Gains And Losses Recorded In Earnings For The Period Relating To Those Level 3 Assets And Liabilities That Were Still Held At The End Of The Period    
Investment income, net of related expenses 105,000 106,000
Investment related gains (losses), net 0 (108,000)
Claims & other policy benefits 0 0
Interest credited 0 0
Policy acquisition costs and other insurance expenses 0 0
Availableforsale Securities Member | Asset Backed Securities Member
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]    
Balance, Beginning of period 232,391,000 193,492,000
Total gains or (losses) (realized/unrealized)    
Investment income, net of related expenses 878,000 249,000
Investment related gains (losses), net (1,747,000) (670,000)
Claims and other policy benefits 0 0
Interest credited 0 0
Policy acquisition costs and other insurance expenses 0 0
Included in other comprehensive income 12,036,000 6,696,000
Purchases 55,881,000 0
Sales (8,297,000) 0
Settlements (5,877,000) (3,865,000)
Transfers into Level 3 2,966,000 1,080,000
Transfers out of Level 3 0 (50,620,000)
Balance, End of period 288,231,000 146,362,000
Unrealized Gains And Losses Recorded In Earnings For The Period Relating To Those Level 3 Assets And Liabilities That Were Still Held At The End Of The Period    
Investment income, net of related expenses 882,000 249,000
Investment related gains (losses), net 0 (607,000)
Claims & other policy benefits 0 0
Interest credited 0 0
Policy acquisition costs and other insurance expenses 0 0
Availableforsale Securities Member | Commercial Mortgage Backed Securities Member
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]    
Balance, Beginning of period 167,006,000 115,976,000
Total gains or (losses) (realized/unrealized)    
Investment income, net of related expenses 502,000 588,000
Investment related gains (losses), net (870,000) (12,075,000)
Claims and other policy benefits 0 0
Interest credited 0 0
Policy acquisition costs and other insurance expenses 0 0
Included in other comprehensive income 12,500,000 13,521,000
Purchases 0 0
Sales (1,604,000) 0
Settlements (2,240,000) 0
Transfers into Level 3 0 10,846,000
Transfers out of Level 3 0 (10,178,000)
Balance, End of period 175,294,000 118,678,000
Unrealized Gains And Losses Recorded In Earnings For The Period Relating To Those Level 3 Assets And Liabilities That Were Still Held At The End Of The Period    
Investment income, net of related expenses 501,000 588,000
Investment related gains (losses), net 0 (12,075,000)
Claims & other policy benefits 0 0
Interest credited 0 0
Policy acquisition costs and other insurance expenses 0 0
Availableforsale Securities Member | US Treasury And Government Member
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]    
Balance, Beginning of period 4,538,000  
Total gains or (losses) (realized/unrealized)    
Investment income, net of related expenses 0  
Investment related gains (losses), net 0  
Claims and other policy benefits 0  
Interest credited 0  
Policy acquisition costs and other insurance expenses 0  
Included in other comprehensive income 0  
Purchases 0  
Sales 0  
Settlements 0  
Transfers into Level 3 0  
Transfers out of Level 3 (4,538,000)  
Balance, End of period 0  
Unrealized Gains And Losses Recorded In Earnings For The Period Relating To Those Level 3 Assets And Liabilities That Were Still Held At The End Of The Period    
Investment income, net of related expenses 0  
Investment related gains (losses), net 0  
Claims & other policy benefits 0  
Interest credited 0  
Policy acquisition costs and other insurance expenses 0  
Availableforsale Securities Member | US States And Political Subdivisions Member
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]    
Balance, Beginning of period 43,212,000 10,373,000
Total gains or (losses) (realized/unrealized)    
Investment income, net of related expenses 9,000 (5,000)
Investment related gains (losses), net (4,000) (4,000)
Claims and other policy benefits 0 0
Interest credited 0 0
Policy acquisition costs and other insurance expenses 0 0
Included in other comprehensive income (553,000) 406,000
Purchases 0 0
Sales 0 0
Settlements (25,000) (23,000)
Transfers into Level 3 0 0
Transfers out of Level 3 0 (5,508,000)
Balance, End of period 42,639,000 5,239,000
Unrealized Gains And Losses Recorded In Earnings For The Period Relating To Those Level 3 Assets And Liabilities That Were Still Held At The End Of The Period    
Investment income, net of related expenses 9,000 (5,000)
Investment related gains (losses), net 0 0
Claims & other policy benefits 0 0
Interest credited 0 0
Policy acquisition costs and other insurance expenses 0 0
Availableforsale Securities Member | Other Foreign Government, Supranational And Foreign Government-Sponsored Enterprises
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]    
Balance, Beginning of period 28,280,000  
Total gains or (losses) (realized/unrealized)    
Investment income, net of related expenses (75,000)  
Investment related gains (losses), net 0  
Claims and other policy benefits 0  
Interest credited 0  
Policy acquisition costs and other insurance expenses 0  
Included in other comprehensive income (340,000)  
Purchases 0  
Sales 0  
Settlements 0  
Transfers into Level 3 0  
Transfers out of Level 3 0  
Balance, End of period 27,865,000  
Unrealized Gains And Losses Recorded In Earnings For The Period Relating To Those Level 3 Assets And Liabilities That Were Still Held At The End Of The Period    
Investment income, net of related expenses (75,000)  
Investment related gains (losses), net 0  
Claims & other policy benefits 0  
Interest credited 0  
Policy acquisition costs and other insurance expenses $ 0