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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, 2012
Dec. 31, 2011
AFS Fair Value, Less than 12 months $ 229,380 $ 217,502
AFS Unrealized Losses, Less than 12 months (3,665) [1] (5,747) [1]
AFS Fair Value, 12 months or longer 46,166 46,097
AFS Unrealized Losses, 12 months or longer (3,486) [1] (3,719) [1]
HTM Unrecognized Gains, Less than 12 months 81 [2] 78 [2]
HTM Unrecognized Gains, 12 months or longer 1,738 [2] 1,822 [2]
Total AFS and HTM Fair Value, Less than 12 months 231,222 224,746
Total AFS and HTM Unrealized Losses, Less than 12 months (3,753) [1] (5,841) [1]
Total AFS and HTM Fair Value, 12 months or longer 58,373 61,126
Total AFS and HTM Unrealized Losses, 12 months or longer (6,095) [1] (6,694) [1]
AFS Fixed Maturity Securities [Member]
    
AFS Fair Value, Less than 12 months 218,132 216,759
AFS Unrealized Losses, Less than 12 months (3,272) [1] (5,659) [1]
AFS Fair Value, 12 months or longer 46,166 46,097
AFS Unrealized Losses, 12 months or longer (3,486) [1] (3,719) [1]
HTM Fair Value, Less than 12 months 1,842 7,244
HTM Unrealized Losses, Less than 12 months (88) [1] (94) [1]
HTM Unrecognized Gains, Less than 12 months 81 [2] 78 [2]
HTM Fair Value, 12 months or longer 12,207 15,029
HTM Unrealized Losses, 12 months or longer (2,609) [1] (2,975) [1]
HTM Unrecognized Gains, 12 months or longer 1,738 [2] 1,822 [2]
AFS Fixed Maturity Securities [Member] | U.S. Government and Government Agencies [Member]
    
AFS Fair Value, Less than 12 months 12,738  
AFS Unrealized Losses, Less than 12 months (104) [1]  
AFS Fair Value, 12 months or longer 0  
AFS Unrealized Losses, 12 months or longer 0 [1]  
AFS Fixed Maturity Securities [Member] | Foreign Government [Member]
    
AFS Fair Value, Less than 12 months 5,868 8,299
AFS Unrealized Losses, Less than 12 months (338) [1] (556) [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] | Obligations of States and Political Subdivisions [Member]
    
AFS Fair Value, Less than 12 months 56,839 517
AFS Unrealized Losses, Less than 12 months (1,507) [1] (1) [1]
AFS Fair Value, 12 months or longer 1,202 1,740
AFS Unrealized Losses, 12 months or longer (10) [1] (45) [1]
HTM Fair Value, Less than 12 months 1,842 7,244
HTM Unrealized Losses, Less than 12 months (88) [1] (94) [1]
HTM Unrecognized Gains, Less than 12 months 81 [2] 78 [2]
HTM Fair Value, 12 months or longer 6,682 9,419
HTM Unrealized Losses, 12 months or longer (389) [1] (519) [1]
HTM Unrecognized Gains, 12 months or longer 241 [2] 324 [2]
AFS Fixed Maturity Securities [Member] | Corporate Securities [Member]
    
AFS Fair Value, Less than 12 months 94,148 157,510
AFS Unrealized Losses, Less than 12 months (1,005) [1] (4,415) [1]
AFS Fair Value, 12 months or longer 12,310 14,084
AFS Unrealized Losses, 12 months or longer (338) [1] (881) [1]
AFS Fixed Maturity Securities [Member] | Asset-backed Securities ("ABS") [Member]
    
AFS Fair Value, Less than 12 months 3,971 15,808
AFS Unrealized Losses, Less than 12 months (27) [1] (14) [1]
AFS Fair Value, 12 months or longer 1,318 702
AFS Unrealized Losses, 12 months or longer (29) [1] (32) [1]
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 2,834 2,816
HTM Unrealized Losses, 12 months or longer (968) [1] (1,009) [1]
HTM Unrecognized Gains, 12 months or longer 748 [2] 737 [2]
AFS Fixed Maturity Securities [Member] | Commercial Mortgage-backed Securities ("CMBS") [Member]
    
AFS Fair Value, Less than 12 months 4,432 4,822
AFS Unrealized Losses, Less than 12 months (9) [1] (48) [1]
AFS Fair Value, 12 months or longer 15,603 14,564
AFS Unrealized Losses, 12 months or longer (2,560) [1] (1,619) [1]
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 2,691 2,794
HTM Unrealized Losses, 12 months or longer (1,252) [1] (1,447) [1]
HTM Unrecognized Gains, 12 months or longer 749 [2] 761 [2]
AFS Fixed Maturity Securities [Member] | Residential Mortgage Backed Securities ("RMBS") [Member]
    
AFS Fair Value, Less than 12 months 40,136 29,803
AFS Unrealized Losses, Less than 12 months (282) [1] (625) [1]
AFS Fair Value, 12 months or longer 15,733 15,007
AFS Unrealized Losses, 12 months or longer (549) [1] (1,142) [1]
Equity Securities [Member]
    
AFS Fair Value, Less than 12 months 11,248 743
AFS Unrealized Losses, Less than 12 months (393) [1] (88) [1]
AFS Fair Value, 12 months or longer 0 0
AFS Unrealized Losses, 12 months or longer $ 0 [1] $ 0 [1]
[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] 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.