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Investments (Fair Value and Gross Pre-Tax Net Unrealized Unrecognized Loss of Securities By Length of Time) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
AFS Fair Value, Less than 12 months $ 1,245,520 $ 125,166
AFS Unrealized Losses, Less than 12 months (45,299) [1] (1,276) [1]
AFS Fair Value, 12 months or longer 9,616 19,736
AFS Unrealized Losses, 12 months or longer (891) [1] (1,558) [1]
HTM Fair Value, Less than 12 months 180 1,218
HTM Unrealized Losses, Less than 12 months (3) [1] (33) [1]
HTM Unrecognized Gains, Less than 12 months 3 [2] 29 [2]
HTM Fair Value, 12 months or longer 3,505 3,968
HTM Unrealized Losses, 12 months or longer (737) [1] (887) [1]
HTM Unrecognized Gains, 12 months or longer 667 [2] 791 [2]
Total AFS and HTM Fair Value, Less than 12 months 1,245,700 126,384
Total AFS and HTM Unrealized Losses, Less than 12 months (45,302) [1] (1,309) [1]
Total AFS and HTM Fair Value, 12 months or longer 13,121 23,704
Total AFS and HTM Unrealized Losses, 12 months or longer (1,628) [1] (2,445) [1]
Obligations of States and Political Subdivisions [Member]
    
HTM Fair Value, Less than 12 months 180 1,218
HTM Unrealized Losses, Less than 12 months (3) [1] (33) [1]
HTM Unrecognized Gains, Less than 12 months 3 [2] 29 [2]
HTM Fair Value, 12 months or longer 702 1,108
HTM Unrealized Losses, 12 months or longer (28) [1] (47) [1]
HTM Unrecognized Gains, 12 months or longer 20 [2] 38 [2]
Asset-backed Securities [Member]
    
HTM Fair Value, Less than 12 months 0 0
HTM Unrealized Losses, Less than 12 months 0 [1] 0 [1]
HTM Unrecognized Gains, Less than 12 months 0 [2] 0 [2]
HTM Fair Value, 12 months or longer 2,803 2,860
HTM Unrealized Losses, 12 months or longer (709) [1] (840) [1]
HTM Unrecognized Gains, 12 months or longer 647 [2] 753 [2]
AFS Fixed Maturity Securities [Member]
    
AFS Fair Value, Less than 12 months 1,228,572 109,265
AFS Unrealized Losses, Less than 12 months (44,534) [1] (817) [1]
AFS Fair Value, 12 months or longer 9,616 19,736
AFS Unrealized Losses, 12 months or longer (891) [1] (1,558) [1]
AFS Fixed Maturity Securities [Member] | U.S. Government and Government Agencies [Member]
    
AFS Fair Value, Less than 12 months 16,151 518
AFS Unrealized Losses, Less than 12 months (369) [1] (1) [1]
AFS Fair Value, 12 months or longer 0 0
AFS Unrealized Losses, 12 months or longer 0 [1] 0 [1]
AFS Fixed Maturity Securities [Member] | Foreign Government [Member]
    
AFS Fair Value, Less than 12 months 1,058 0
AFS Unrealized Losses, Less than 12 months (10) [1] 0 [1]
AFS Fair Value, 12 months or longer 2,880 2,871
AFS Unrealized Losses, 12 months or longer (117) [1] (124) [1]
AFS Fixed Maturity Securities [Member] | Obligations of States and Political Subdivisions [Member]
    
AFS Fair Value, Less than 12 months 393,204 32,383
AFS Unrealized Losses, Less than 12 months (18,818) [1] (327) [1]
AFS Fair Value, 12 months or longer 0 0
AFS Unrealized Losses, 12 months or longer 0 [1] 0 [1]
AFS Fixed Maturity Securities [Member] | Corporate Securities [Member]
    
AFS Fair Value, Less than 12 months 431,753 50,880
AFS Unrealized Losses, Less than 12 months (14,699) [1] (402) [1]
AFS Fair Value, 12 months or longer 2,952 0
AFS Unrealized Losses, 12 months or longer (151) [1] 0 [1]
AFS Fixed Maturity Securities [Member] | Asset-backed Securities [Member]
    
AFS Fair Value, Less than 12 months 98,136 9,137
AFS Unrealized Losses, Less than 12 months (911) [1] (9) [1]
AFS Fair Value, 12 months or longer 0 0
AFS Unrealized Losses, 12 months or longer 0 [1] 0 [1]
AFS Fixed Maturity Securities [Member] | Commercial Mortgage-backed Securities ("CMBS") [Member]
    
AFS Fair Value, Less than 12 months 67,456 7,637
AFS Unrealized Losses, Less than 12 months (3,340) [1] (19) [1]
AFS Fair Value, 12 months or longer 2,158 11,830
AFS Unrealized Losses, 12 months or longer (442) [1] (1,197) [1]
AFS Fixed Maturity Securities [Member] | Residential Mortgage Backed Securities ("RMBS") [Member]
    
AFS Fair Value, Less than 12 months 220,814 8,710
AFS Unrealized Losses, Less than 12 months (6,387) [1] (59) [1]
AFS Fair Value, 12 months or longer 1,626 5,035
AFS Unrealized Losses, 12 months or longer (181) [1] (237) [1]
Equity Securities [Member]
    
AFS Fair Value, Less than 12 months 16,948 15,901
AFS Unrealized Losses, Less than 12 months (765) [1] (459) [1]
AFS Fair Value, 12 months or longer 0 0
AFS Unrealized Losses, 12 months or longer $ 0 [1] $ 0 [1]
[1] Gross unrealized losses include non-OTTI unrealized amounts and OTTI losses recognized in AOCI. In addition, this column includes remaining unrealized gain or loss amounts on securities that were transferred to an HTM designation in the first quarter of 2009 for those securities that are in a net unrealized/unrecognized loss position.
[2] Unrecognized gains represent fair value fluctuations from the later of: (i) the date a security is designated as HTM; or (ii) the date that an OTTI charge is recognized on an HTM security.