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Fair Value Disclosures (Details 3) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
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 $ (370,884) $ (183,685) $ (361,456) $ (274,220)
Total gains or (losses) (realized/unrealized)        
Investment income, net of related expenses 0 0 0 0
Investment related gains (losses), net (4,453) 10,525 (13,881) 101,060
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 0 0 0 0
Sales 0 0 0 0
Settlements 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Balance, End of period (375,337) (173,160) (375,337) (173,160)
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 (4,452) 10,525 (13,881) 101,060
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
Nonredeemable Preferred Stock Member
        
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]        
Balance, Beginning of period   420   420
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   0   0
Purchases   0   0
Sales   (420)   (420)
Settlements   0   0
Transfers into Level 3   0   0
Transfers out of Level 3   0   0
Balance, End of period   0   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   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
Equity Securities Other Member
        
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]        
Balance, Beginning of period 11,827 14,134 11,489 16,416
Total gains or (losses) (realized/unrealized)        
Investment income, net of related expenses 0 0 0 0
Investment related gains (losses), net 1,098 3,504 1,098 3,504
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 505 (2,704) 843 (4,987)
Purchases 108 0 108 0
Sales (3,788) (3,933) (3,788) (3,932)
Settlements 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 (6,523) 0 (6,523) 0
Balance, End of period 3,227 11,001 3,227 11,001
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 (183) 0 (183) 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 3,514 82,482 4,945 75,431
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 1,003 4,473 (325) 12,312
Included in other comprehensive income 0 0 0 0
Purchases 0 1,831 0 4,264
Sales 0 0 0 0
Settlements (101) (2,757) (204) (5,978)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Balance, End of period 4,416 86,029 4,416 86,029
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 1,143 10,645 (46) 18,485
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 (903,282) (739,017) (1,028,241) (721,485)
Total gains or (losses) (realized/unrealized)        
Investment income, net of related expenses 0 0 0 0
Investment related gains (losses), net (74,929) (25,860) 71,446 6,794
Claims and other policy benefits (1,721) (603) 557 317
Interest credited 27,825 (36,267) 6,632 (86,116)
Policy acquisition costs and other insurance expenses 0 0 0 0
Included in other comprehensive income 0 0 0 0
Purchases (16,107) (21,302) (39,697) (41,220)
Sales 0 0 0 0
Settlements 29,287 18,878 50,376 37,539
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Balance, End of period (938,927) (804,171) (938,927) (804,171)
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 (76,737) (25,861) 67,887 6,794
Claims & other policy benefits (1,959) (1,370) 79 (16)
Interest credited (1,288) (55,145) (43,395) (123,655)
Policy acquisition costs and other insurance expenses 0 0 0 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 977,671 940,470 974,169 872,179
Total gains or (losses) (realized/unrealized)        
Investment income, net of related expenses 77 75 107 162
Investment related gains (losses), net (696) 321 (1,280) 741
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 10,341 9,228 9,659 9,450
Purchases 68,275 97,606 89,435 197,807
Sales (17,876) (19,563) (27,285) (21,071)
Settlements (32,497) (25,050) (53,371) (75,730)
Transfers into Level 3 0 26,268 17,445 60,679
Transfers out of Level 3 (11,281) (51,795) (14,865) (66,657)
Balance, End of period 994,014 977,560 994,014 977,560
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 84 56 114 130
Investment related gains (losses), net (380) 0 (1,106) (514)
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 54,435 138,568 81,655 183,291
Total gains or (losses) (realized/unrealized)        
Investment income, net of related expenses 188 233 298 493
Investment related gains (losses), net (315) (45) (36) (401)
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 (172) (2,910) 1,408 4,484
Purchases 337 5,329 582 5,782
Sales (8,219) (6,635) (16,224) (20,701)
Settlements (1,902) (4,205) (3,702) (12,365)
Transfers into Level 3 7,176 0 7,176 5,001
Transfers out of Level 3 (1,937) (26,905) (21,566) (62,154)
Balance, End of period 49,591 103,430 49,591 103,430
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 148 216 255 474
Investment related gains (losses), net (161) (44) (269) (44)
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 146,362 202,246 193,492 228,558
Total gains or (losses) (realized/unrealized)        
Investment income, net of related expenses 195 322 444 904
Investment related gains (losses), net 164 (3,671) (506) (2,827)
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 1,782 3,182 8,477 7,413
Purchases 2,012 25,007 2,012 29,880
Sales (7,902) (3,998) (7,902) (22,298)
Settlements (3,238) (8,693) (7,103) (16,841)
Transfers into Level 3 0 10,175 1,080 21,501
Transfers out of Level 3 (11,017) (35,797) (61,636) (57,517)
Balance, End of period 128,358 188,773 128,358 188,773
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 151 331 400 838
Investment related gains (losses), net 0 (2,998) (607) (3,551)
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 118,678 203,394 115,976 147,556
Total gains or (losses) (realized/unrealized)        
Investment income, net of related expenses 545 611 1,133 1,169
Investment related gains (losses), net 393 (2,242) (11,682) (2,732)
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 (2,273) (5,825) 11,248 27,316
Purchases 0 5,069 0 7,683
Sales (1,552) 0 (1,552) 0
Settlements (58) (3,080) (58) (3,410)
Transfers into Level 3 0 11,665 10,846 66,854
Transfers out of Level 3 0 (58,827) (10,178) (93,671)
Balance, End of period 115,733 150,765 115,733 150,765
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 545 601 1,133 1,155
Investment related gains (losses), net 0 (2,254) (12,075) (2,743)
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 5,239 45,081 10,373 6,983
Total gains or (losses) (realized/unrealized)        
Investment income, net of related expenses 9 2 4 370
Investment related gains (losses), net (4) (3) (8) (8)
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 827 939 1,233 3,615
Purchases 0 0 0 871
Sales 0 0 0 0
Settlements (23) (22) (46) (43)
Transfers into Level 3 8,438 14,260 8,438 48,469
Transfers out of Level 3 0 (37,325) (5,508) (37,325)
Balance, End of period 14,486 22,932 14,486 22,932
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 2 4 370
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 | 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   6,495   6,736
Total gains or (losses) (realized/unrealized)        
Investment income, net of related expenses   0   1
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   110   8
Purchases   0   0
Sales   0   (161)
Settlements   0   0
Transfers into Level 3   0   21
Transfers out of Level 3   (2,531)   (2,531)
Balance, End of period   4,074   4,074
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   (36)
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