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Investments (Available-For-Sale Securities Disclosure) (Details) (USD $)
Jun. 30, 2011
securities
years
Dec. 31, 2010
Cost/Amortized Cost $ 2,570,766,000 $ 2,344,027,000
Unrealized Gains 99,860,000 83,786,000
Unrealized Losses (8,812,000) (15,435,000)
Fair Value 2,661,814,000 2,412,378,000
Number of held to maturity securities transferred to available-for-sale 18  
Securities reclassified from the HTM category to AFS carrying value 46,600,000  
Securities reclassified from the HTM category to AFS net unrecognized gain 1,200,000  
AFS Fixed Maturity Securities [Member]
    
Cost/Amortized Cost 2,442,579,000 2,285,988,000
Unrealized Gains 89,807,000 72,189,000
Unrealized Losses (7,149,000) (15,435,000)
Fair Value 2,525,237,000 2,342,742,000
AFS Fixed Maturity Securities [Member] | U.S. Government and Government Agencies [Member]
    
Cost/Amortized Cost 288,760,000 312,384,000
Unrealized Gains 8,223,000 8,292,000
Unrealized Losses (52,000) (147,000)
Fair Value 296,931,000 [1] 320,529,000 [1]
Corporate securities fully guaranteed by the Federal Deposit Insurance Corporation ("FDIC") 98,900,000 121,000,000
AFS Fixed Maturity Securities [Member] | Foreign Government [Member]
    
Cost/Amortized Cost 29,768,000 19,035,000
Unrealized Gains 477,000 280,000
Unrealized Losses (145,000) (349,000)
Fair Value 30,100,000 18,966,000
AFS Fixed Maturity Securities [Member] | Obligations of States and Political Subdivisions [Member]
    
Cost/Amortized Cost 512,957,000 512,013,000
Unrealized Gains 29,665,000 22,534,000
Unrealized Losses (6,000) (650,000)
Fair Value 542,616,000 533,897,000
AFS Fixed Maturity Securities [Member] | Corporate Securities [Member]
    
Cost/Amortized Cost 1,047,110,000 973,835,000
Unrealized Gains 35,518,000 28,674,000
Unrealized Losses (4,125,000) (8,784,000)
Fair Value 1,078,503,000 993,725,000
AFS Fixed Maturity Securities [Member] | Asset-backed Securities ("ABS") [Member]
    
Cost/Amortized Cost 77,573,000 48,558,000
Unrealized Gains 760,000 514,000
Unrealized Losses (128,000) (339,000)
Fair Value 78,205,000 48,733,000
AFS Fixed Maturity Securities [Member] | Commercial Mortgage-backed Securities ("CMBS") [Member]
    
Cost/Amortized Cost 105,706,000 103,374,000
Unrealized Gains 4,599,000 4,024,000
Unrealized Losses (1,181,000) (2,923,000)
Fair Value 109,124,000 [2] 104,475,000 [2]
Government guaranteed agency securities fair value 72,300,000 71,900,000
AFS Fixed Maturity Securities [Member] | Residential Mortgage Backed Securities ("RMBS") [Member]
    
Cost/Amortized Cost 380,705,000 316,789,000
Unrealized Gains 10,565,000 7,871,000
Unrealized Losses (1,512,000) (2,243,000)
Fair Value 389,758,000 [3] 322,417,000 [3]
Government guaranteed agency securities fair value 94,700,000 91,100,000
Equity Securities [Member]
    
Cost/Amortized Cost 128,187,000 58,039,000
Unrealized Gains 10,053,000 11,597,000
Unrealized Losses (1,663,000) 0
Fair Value $ 136,577,000 $ 69,636,000
[1] 1 U.S. government includes corporate securities fully guaranteed by the Federal Deposit Insurance Corporation ("FDIC") with a fair value of $98.9 million at June 30, 2011 and $121.0 million at December 31, 2010.
[2] 2 CMBS includes government guaranteed agency securities with a fair value of $72.3 million at June 30, 2011 and $71.9 million at December 31, 2010.
[3] 3 RMBS includes government guaranteed agency securities with a fair value of $94.7 million at June 30, 2011 and $91.1 million at December 31, 2010.