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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
Mar. 31, 2013
Dec. 31, 2012
AFS Fair Value, Less than 12 months $ 376,874 $ 125,166
AFS Unrealized Losses, Less than 12 months (3,033) [1] (1,276) [1]
AFS Fair Value, 12 months or longer 20,190 19,736
AFS Unrealized Losses, 12 months or longer (1,060) [1] (1,558) [1]
HTM Fair Value, Less than 12 months 358 1,218
HTM Unrealized Losses, Less than 12 months (32) [1] (33) [1]
HTM Unrecognized Gains, Less than 12 months 30 [2] 29 [2]
HTM Fair Value, 12 months or longer 3,751 3,968
HTM Unrealized Losses, 12 months or longer (833) [1] (887) [1]
HTM Unrecognized Gains, 12 months or longer 766 [2] 791 [2]
Total AFS and HTM Fair Value, Less than 12 months 377,232 126,384
Total AFS and HTM Unrealized Losses, Less than 12 months (3,065) [1] (1,309) [1]
Total AFS and HTM Fair Value, 12 months or longer 23,941 23,704
Total AFS and HTM Unrealized Losses, 12 months or longer (1,893) [1] (2,445) [1]
Obligations of States and Political Subdivisions [Member]
    
HTM Fair Value, Less than 12 months 358 1,218
HTM Unrealized Losses, Less than 12 months (32) [1] (33) [1]
HTM Unrecognized Gains, Less than 12 months 30 [2] 29 [2]
HTM Fair Value, 12 months or longer 896 1,108
HTM Unrealized Losses, 12 months or longer (35) [1] (47) [1]
HTM Unrecognized Gains, 12 months or longer 27 [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 2,855 2,860
HTM Unrealized Losses, 12 months or longer (798) [1] (840) [1]
HTM Unrecognized Gains, 12 months or longer 739 [2] 753 [2]
AFS Fixed Maturity Securities [Member]
    
AFS Fair Value, Less than 12 months 352,003 109,265
AFS Unrealized Losses, Less than 12 months (2,592) [1] (817) [1]
AFS Fair Value, 12 months or longer 20,190 19,736
AFS Unrealized Losses, 12 months or longer (1,060) [1] (1,558) [1]
AFS Fixed Maturity Securities [Member] | U.S. Government and Government Agencies [Member]
    
AFS Fair Value, Less than 12 months 3,502 518
AFS Unrealized Losses, Less than 12 months (4) [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 0 0
AFS Unrealized Losses, Less than 12 months 0 [1] 0 [1]
AFS Fair Value, 12 months or longer 2,880 2,871
AFS Unrealized Losses, 12 months or longer (116) [1] (124) [1]
AFS Fixed Maturity Securities [Member] | Obligations of States and Political Subdivisions [Member]
    
AFS Fair Value, Less than 12 months 133,593 32,383
AFS Unrealized Losses, Less than 12 months (1,059) [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 73,175 50,880
AFS Unrealized Losses, Less than 12 months (812) [1] (402) [1]
AFS Fair Value, 12 months or longer 3,059 0
AFS Unrealized Losses, 12 months or longer (48) [1] 0 [1]
AFS Fixed Maturity Securities [Member] | Asset-backed Securities [Member]
    
AFS Fair Value, Less than 12 months 46,519 9,137
AFS Unrealized Losses, Less than 12 months (55) [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 45,901 7,637
AFS Unrealized Losses, Less than 12 months (395) [1] (19) [1]
AFS Fair Value, 12 months or longer 11,269 11,830
AFS Unrealized Losses, 12 months or longer (708) [1] (1,197) [1]
AFS Fixed Maturity Securities [Member] | Residential Mortgage Backed Securities ("RMBS") [Member]
    
AFS Fair Value, Less than 12 months 49,313 8,710
AFS Unrealized Losses, Less than 12 months (267) [1] (59) [1]
AFS Fair Value, 12 months or longer 2,982 5,035
AFS Unrealized Losses, 12 months or longer (188) [1] (237) [1]
Equity Securities [Member]
    
AFS Fair Value, Less than 12 months 24,871 15,901
AFS Unrealized Losses, Less than 12 months (441) [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.