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Fair Value Disclosures (Details 2) (USD $)
In Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
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 $ 940,470 $ 829,277 $ 872,336 $ 1,036,891
Total gains or (losses) (realized/unrealized)        
Investment income, net of related expenses 75 176 162 397
Investment related gains (losses), net 321 (2,040) 741 (150)
Claims and other policy benefits 0 0 0 0
Interest credited 0 0 0 0
Policy acquisition costs and other insurance expenses 0 0 0 0
Included in other comprehensive income 9,228 12,588 9,454 29,765
Purchases, sales and settlements   43,467   37,215
Purchases 97,606   197,807  
Sales (19,563)   (21,232)  
Settlements (25,050)   (75,730)  
Transfers into Level 3 26,268 38,822 60,679 66,135
Transfers out of Level 3 (51,795) (33,321) (66,657) (281,284)
Balance, End of period 977,560 888,969 977,560 888,969
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 56 138 130 293
Investment related gains (losses), net 0 0 (514) (585)
Claims & other policy benefits 0 0 0 0
Interest credited 0 0 0 0
Policy acquisition costs and other insurance expenses 0 0 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 138,568 210,615 183,291 144,457
Total gains or (losses) (realized/unrealized)        
Investment income, net of related expenses 233 505 493 906
Investment related gains (losses), net (45) (4,137) (401) (5,708)
Claims and other policy benefits 0 0 0 0
Interest credited 0 0 0 0
Policy acquisition costs and other insurance expenses 0 0 0 0
Included in other comprehensive income (2,910) 14,005 4,484 14,526
Purchases, sales and settlements   (26,010)   (7,449)
Purchases 5,329   5,782  
Sales (6,635)   (20,701)  
Settlements (4,205)   (12,365)  
Transfers into Level 3 0 25,075 5,001 73,503
Transfers out of Level 3 (26,905) (7,272) (62,154) (7,454)
Balance, End of period 103,430 212,781 103,430 212,781
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 216 496 474 838
Investment related gains (losses), net (44) (1,650) (44) (3,685)
Claims & other policy benefits 0 0 0 0
Interest credited 0 0 0 0
Policy acquisition costs and other insurance expenses 0 0 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 202,246 206,220 228,558 262,767
Total gains or (losses) (realized/unrealized)        
Investment income, net of related expenses 322 997 904 1,533
Investment related gains (losses), net (3,671) (40) (2,827) (512)
Claims and other policy benefits 0 0 0 0
Interest credited 0 0 0 0
Policy acquisition costs and other insurance expenses 0 0 0 0
Included in other comprehensive income 3,182 8,838 7,413 19,275
Purchases, sales and settlements   (5,907)   (13,921)
Purchases 25,007   29,880  
Sales (3,998)   (22,298)  
Settlements (8,693)   (16,841)  
Transfers into Level 3 10,175 19,325 21,501 29,275
Transfers out of Level 3 (35,797) 0 (57,517) (68,984)
Balance, End of period 188,773 229,433 188,773 229,433
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 331 997 838 1,522
Investment related gains (losses), net (2,998) (452) (3,551) (452)
Claims & other policy benefits 0 0 0 0
Interest credited 0 0 0 0
Policy acquisition costs and other insurance expenses 0 0 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 203,394 117,709 147,556 329,560
Total gains or (losses) (realized/unrealized)        
Investment income, net of related expenses 611 1,117 1,169 1,777
Investment related gains (losses), net (2,242) (3,799) (2,732) (3,993)
Claims and other policy benefits 0 0 0 0
Interest credited 0 0 0 0
Policy acquisition costs and other insurance expenses 0 0 0 0
Included in other comprehensive income (5,825) 11,218 27,316 10,274
Purchases, sales and settlements   (135)   4,229
Purchases 5,069   7,683  
Sales 0   0  
Settlements (3,080)   (3,410)  
Transfers into Level 3 11,665 34,380 66,854 44,320
Transfers out of Level 3 (58,827) (9,784) (93,671) (235,461)
Balance, End of period 150,765 150,706 150,765 150,706
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 601 1,117 1,155 1,759
Investment related gains (losses), net (2,254) (1,525) (2,743) (3,992)
Claims & other policy benefits 0 0 0 0
Interest credited 0 0 0 0
Policy acquisition costs and other insurance expenses 0 0 0 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 45,081 11,486 6,983 12,080
Total gains or (losses) (realized/unrealized)        
Investment income, net of related expenses 2 12 370 23
Investment related gains (losses), net (3) (4) (8) (7)
Claims and other policy benefits 0 0 0 0
Interest credited 0 0 0 0
Policy acquisition costs and other insurance expenses 0 0 0 0
Included in other comprehensive income 939 (778) 3,615 500
Purchases, sales and settlements   (20)   (40)
Purchases 0   871  
Sales 0   0  
Settlements (22)   (43)  
Transfers into Level 3 14,260 1,820 48,469 1,820
Transfers out of Level 3 (37,325) 0 (37,325) (1,860)
Balance, End of period 22,932 12,516 22,932 12,516
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 12 370 23
Investment related gains (losses), net 0 0 0 0
Claims & other policy benefits 0 0 0 0
Interest credited 0 0 0 0
Policy acquisition costs and other insurance expenses 0 0 0 0
Availableforsale Securities Member | Foreign Government Debt Securities Member
        
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation Roll Forward        
Balance, Beginning of period 6,495 2,174 6,579 17,303
Total gains or (losses) (realized/unrealized)        
Investment income, net of related expenses 0 1 1 1
Investment related gains (losses), net 0 (12) 0 (11)
Claims and other policy benefits 0 0 0 0
Interest credited 0 0 0 0
Policy acquisition costs and other insurance expenses 0 0 0 0
Included in other comprehensive income 110 36 4 30
Purchases, sales and settlements   4,104   1,258
Purchases 0   0  
Sales 0   0  
Settlements 0   0  
Transfers into Level 3 0 0 21 2,178
Transfers out of Level 3 (2,531) 0 (2,531) (14,456)
Balance, End of period 4,074 6,303 4,074 6,303
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 1 (36) 1
Investment related gains (losses), net 0 0 0 0
Claims & other policy benefits 0 0 0 0
Interest credited 0 0 0 0
Policy acquisition costs and other insurance expenses 0 0 0 0
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 (183,685) (311,859) (274,220) (434,494)
Total gains or (losses) (realized/unrealized)        
Investment income, net of related expenses 0 0 0 0
Investment related gains (losses), net 10,525 32,511 101,060 155,146
Claims and other policy benefits 0 0 0 0
Interest credited 0 0 0 0
Policy acquisition costs and other insurance expenses 0 0 0 0
Included in other comprehensive income 0 0 0 0
Purchases, sales and settlements   0   0
Purchases 0   0  
Sales 0   0  
Settlements 0   0  
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Balance, End of period (173,160) (279,348) (173,160) (279,348)
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 0 0
Investment related gains (losses), net 10,525 32,512 101,060 155,147
Claims & other policy benefits 0 0 0 0
Interest credited 0 0 0 0
Policy acquisition costs and other insurance expenses 0 0 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   0   443
Total gains or (losses) (realized/unrealized)        
Investment income, net of related expenses   0   0
Investment related gains (losses), net   0   0
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   (1)   (1)
Purchases, sales and settlements   1,267   997
Transfers into Level 3   0   (173)
Transfers out of Level 3   0   0
Balance, End of period   1,266   1,266
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   0   0
Claims & other policy benefits   0   0
Interest credited   0   0
Policy acquisition costs and other insurance expenses   0   0
Nonredeemable Preferred Stock Member
        
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation Roll Forward        
Balance, Beginning of period 420 4,098 420 6,775
Total gains or (losses) (realized/unrealized)        
Investment income, net of related expenses 0 0 0 0
Investment related gains (losses), net 0 550 0 550
Claims and other policy benefits 0 0 0 0
Interest credited 0 0 0 0
Policy acquisition costs and other insurance expenses 0 0 0 0
Included in other comprehensive income 0 (22) 0 (141)
Purchases, sales and settlements   (3,000)   (5,146)
Purchases 0   0  
Sales (420)   (420)  
Settlements 0   0  
Transfers into Level 3 0 0 0 (412)
Transfers out of Level 3 0 0 0 0
Balance, End of period 0 1,626 0 1,626
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 0 (1)
Investment related gains (losses), net 0 (3) 0 (3)
Claims & other policy benefits 0 0 0 0
Interest credited 0 0 0 0
Policy acquisition costs and other insurance expenses 0 0 0 0
Equity Securities Other Member
        
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation Roll Forward        
Balance, Beginning of period 14,134 12,836 16,416 10,436
Total gains or (losses) (realized/unrealized)        
Investment income, net of related expenses 0 0 0 0
Investment related gains (losses), net 3,504 0 3,504 0
Claims and other policy benefits   0 0 0
Interest credited 0 0 0 0
Policy acquisition costs and other insurance expenses 0 0 0 0
Included in other comprehensive income (2,704) 3,564 (4,987) 5,339
Purchases, sales and settlements   0   625
Purchases 0   0  
Sales (3,933)   (3,932)  
Settlements 0   0  
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Balance, End of period 11,001 16,400 11,001 16,400
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 0 0
Investment related gains (losses), net 0 0 0 0
Claims & other policy benefits 0 0 0 0
Interest credited 0 0 0 0
Policy acquisition costs and other insurance expenses 0 0 0 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 82,482 67,911 75,431 68,873
Total gains or (losses) (realized/unrealized)        
Investment income, net of related expenses 0 0 0 0
Investment related gains (losses), net 0 0 0 0
Claims and other policy benefits 0 0 0 0
Interest credited 0 0 0 0
Policy acquisition costs and other insurance expenses 4,473 2,690 12,312 1,557
Included in other comprehensive income 0 0 0 0
Purchases, sales and settlements   (447)   (276)
Purchases 1,831   4,264  
Sales 0   0  
Settlements (2,757)   (5,978)  
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Balance, End of period 86,029 70,154 86,029 70,154
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 0 0
Investment related gains (losses), net 0 0 0 0
Claims & other policy benefits 0 0 0 0
Interest credited 0 0 0 0
Policy acquisition costs and other insurance expenses 10,645 4,246 18,485 4,904
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 (739,017) (594,532) (721,485) (608,654)
Total gains or (losses) (realized/unrealized)        
Investment income, net of related expenses 0 0 0 0
Investment related gains (losses), net (25,860) (140,934) 6,794 (133,763)
Claims and other policy benefits (603) (570) 317 (114)
Interest credited (36,267) (17,137) (86,116) (4,949)
Policy acquisition costs and other insurance expenses 0 0 0 0
Included in other comprehensive income 0 0 0 0
Purchases, sales and settlements   (6,431)   (12,124)
Purchases (21,302)   (41,220)  
Sales 0   0  
Settlements 18,878   37,539  
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Balance, End of period (804,171) (759,604) (804,171) (759,604)
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 0 0
Investment related gains (losses), net (25,861) (140,934) 6,794 (133,763)
Claims & other policy benefits (1,370) (731) (16) (750)
Interest credited (55,145) (28,020) (123,655) (25,330)
Policy acquisition costs and other insurance expenses $ 0 $ 0 $ 0 $ 0