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Investments (Fair Value and Gross Pre-Tax Net Unrealized Unrecognized Loss of Securities By Length of Time) (Details) (USD $)
 6 Months Ended
Jun. 30, 2011
securities
years
Dec. 31, 2010
securities
years
AFS Fair Value, Less than 12 months $ 427,065,000 $ 524,328,000
AFS Unrealized Losses, Less than 12 months (6,962,000) [1] (11,572,000) [1]
AFS Fair Value, 12 months or longer 18,633,000 32,905,000
AFS Unrealized Losses, 12 months or longer (1,850,000) [1] (3,863,000) [1]
HTM Fair Value, Less than 12 months 13,127,000 27,149,000
HTM Unrealized (Losses) Gains, Less than 12 months (549,000) [1] (1,346,000) [1]
HTM Unrecognized Gains (Losses), Less than 12 months 476,000 [2] 8,000 [2]
HTM Fair Value, 12 months or longer 33,293,000 36,626,000
HTM Unrealized Losses, 12 months or longer (6,857,000) [1] (7,035,000) [1]
HTM Unrecognized Gains, 12 months or longer 2,807,000 [2] 2,251,000 [2]
Total AFS and HTM Fair Value, Less than 12 months 440,192,000 551,477,000
Total AFS and HTM Unrealized (Losses) Gains, Less than 12 months (7,511,000) [1] (12,918,000) [1]
Total AFS and HTM Fair Value, 12 months or longer 51,926,000 69,531,000
Total AFS and HTM Unrealized Losses, 12 months or longer (8,707,000) [1] (10,898,000) [1]
Number of securities in an unrealized/unrecognized loss position 225 199
Securities in an unrealized/unrecognized loss position fair value 492,100,000 621,000,000
Decrease in unrealized/unrecognized losses 8,600,000  
Securities In Unrealized Unrecognized Loss Position For More Than Twelve Months Unrealized Unrecognized Loss 5,900,000  
AFS Fixed Maturity Securities [Member]
    
AFS Fair Value, Less than 12 months 375,415,000 524,328,000
AFS Unrealized Losses, Less than 12 months (5,299,000) [1] (11,572,000) [1]
AFS Fair Value, 12 months or longer 18,633,000 32,905,000
AFS Unrealized Losses, 12 months or longer (1,850,000) [1] (3,863,000) [1]
AFS Fixed Maturity Securities [Member] | U.S. Government and Government Agencies [Member]
    
AFS Fair Value, Less than 12 months 4,051,000 [3] 3,956,000 [3]
AFS Unrealized Losses, Less than 12 months (52,000) [1],[3] (147,000) [1],[3]
AFS Fair Value, 12 months or longer 0 [3] 0 [3]
AFS Unrealized Losses, 12 months or longer 0 [1],[3] 0 [1],[3]
AFS Fixed Maturity Securities [Member] | Foreign Government [Member]
    
AFS Fair Value, Less than 12 months 15,355,000 10,776,000
AFS Unrealized Losses, Less than 12 months (145,000) [1] (349,000) [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 0 40,410,000
AFS Unrealized Losses, Less than 12 months 0 [1] (650,000) [1]
AFS Fair Value, 12 months or longer 305,000 0
AFS Unrealized Losses, 12 months or longer (6,000) [1] 0 [1]
AFS Fixed Maturity Securities [Member] | Corporate Securities [Member]
    
AFS Fair Value, Less than 12 months 254,600,000 362,502,000
AFS Unrealized Losses, Less than 12 months (4,125,000) [1] (8,784,000) [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] | Asset-backed Securities ("ABS") [Member]
    
AFS Fair Value, Less than 12 months 25,317,000 30,297,000
AFS Unrealized Losses, Less than 12 months (56,000) [1] (273,000) [1]
AFS Fair Value, 12 months or longer 765,000 880,000
AFS Unrealized Losses, 12 months or longer (72,000) [1] (66,000) [1]
AFS Fixed Maturity Securities [Member] | Commercial Mortgage-backed Securities ("CMBS") [Member]
    
AFS Fair Value, Less than 12 months 8,064,000 5,453,000
AFS Unrealized Losses, Less than 12 months (33,000) [1] (271,000) [1]
AFS Fair Value, 12 months or longer 10,362,000 11,115,000
AFS Unrealized Losses, 12 months or longer (1,148,000) [1] (2,652,000) [1]
AFS Fixed Maturity Securities [Member] | Residential Mortgage Backed Securities ("RMBS") [Member]
    
AFS Fair Value, Less than 12 months 68,028,000 70,934,000
AFS Unrealized Losses, Less than 12 months (888,000) [1] (1,098,000) [1]
AFS Fair Value, 12 months or longer 7,201,000 20,910,000
AFS Unrealized Losses, 12 months or longer (624,000) [1] (1,145,000) [1]
Equity Securities [Member]
    
AFS Fair Value, Less than 12 months 51,650,000 0
AFS Unrealized Losses, Less than 12 months (1,663,000) [1] 0 [1]
AFS Fair Value, 12 months or longer 0 0
AFS Unrealized Losses, 12 months or longer 0 [1] 0 [1]
Securities Which Have Experienced A Shortfall In Interest Payments [Member] | Commercial Mortgage-backed Securities ("CMBS") [Member]
    
Unrealized unrecognized losses on securities previously impaired 500,000  
Unrealized unrecognized losses on securities previously impaired number of securities 1  
Obligations of States and Political Subdivisions [Member]
    
HTM Fair Value, Less than 12 months 13,127,000 21,036,000
HTM Unrealized (Losses) Gains, Less than 12 months (549,000) [1] (381,000) [1]
HTM Unrecognized Gains (Losses), Less than 12 months 476,000 [2] 45,000 [2]
HTM Fair Value, 12 months or longer 23,379,000 27,855,000
HTM Unrealized Losses, 12 months or longer (1,630,000) [1] (1,969,000) [1]
HTM Unrecognized Gains, 12 months or longer 1,312,000 [2] 670,000 [2]
Corporate Securities [Member]
    
HTM Fair Value, Less than 12 months   1,985,000
HTM Unrealized (Losses) Gains, Less than 12 months   (434,000) [1]
HTM Unrecognized Gains (Losses), Less than 12 months   420,000 [2]
HTM Fair Value, 12 months or longer   0
HTM Unrealized Losses, 12 months or longer   0 [1]
HTM Unrecognized Gains, 12 months or longer   0 [2]
Asset-backed Securities ("ABS") [Member]
    
HTM Fair Value, Less than 12 months 0 507,000
HTM Unrealized (Losses) Gains, Less than 12 months 0 [1] (546,000) [1]
HTM Unrecognized Gains (Losses), Less than 12 months 0 [2] (440,000) [2]
HTM Fair Value, 12 months or longer 3,364,000 2,931,000
HTM Unrealized Losses, 12 months or longer (1,635,000) [1] (1,095,000) [1]
HTM Unrecognized Gains, 12 months or longer 340,000 [2] 747,000 [2]
Commercial Mortgage-backed Securities ("CMBS") [Member]
    
HTM Fair Value, Less than 12 months 0 3,621,000
HTM Unrealized (Losses) Gains, Less than 12 months 0 [1] 15,000 [1]
HTM Unrecognized Gains (Losses), Less than 12 months 0 [2] (17,000) [2]
HTM Fair Value, 12 months or longer 6,438,000 5,745,000
HTM Unrealized Losses, 12 months or longer (3,554,000) [1] (3,933,000) [1]
HTM Unrecognized Gains, 12 months or longer 1,137,000 [2] 833,000 [2]
Securities In Unrealized Unrecognized Loss Position For More Than Twelve Months Unrealized Unrecognized Loss 3,600,000  
Unrealized unrecognized losses on securities previously impaired 3,100,000  
Unrealized unrecognized losses on securities previously impaired number of securities 3  
Residential Mortgage Backed Securities ("RMBS") [Member]
    
HTM Fair Value, Less than 12 months 0 0
HTM Unrealized (Losses) Gains, Less than 12 months 0 [1] 0 [1]
HTM Unrecognized Gains (Losses), Less than 12 months 0 [2] 0 [2]
HTM Fair Value, 12 months or longer 112,000 95,000
HTM Unrealized Losses, 12 months or longer (38,000) [1] (38,000) [1]
HTM Unrecognized Gains, 12 months or longer $ 18,000 [2] $ 1,000 [2]
[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 holding gains/(losses) 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.
[3] U.S. government includes corporate securities fully guaranteed by the FDIC.