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Investments (Available-For-Sale Securities Disclosure) (Details) (USD $)
Dec. 31, 2011
Dec. 31, 2010
Cost/Amortized Cost $ 2,910,682,000 $ 2,344,027,000
Unrealized Gains 153,512,000 83,786,000
Unrealized Losses (9,466,000) (15,435,000)
Fair Value 3,054,728,000 2,412,378,000
Corporate securities fully guaranteed by the Federal Deposit Insurance Corporation ("FDIC") 76,500,000 121,000,000
AFS Fixed Maturity Securities [Member]
    
Cost/Amortized Cost 2,766,856,000 2,285,988,000
Unrealized Gains 139,895,000 72,189,000
Unrealized Losses (9,378,000) (15,435,000)
Fair Value 2,897,373,000 2,342,742,000
AFS Fixed Maturity Securities [Member] | U.S. Government and Government Agencies [Member]
    
Cost/Amortized Cost 333,504,000 [1] 312,384,000 [1]
Unrealized Gains 20,292,000 [1] 8,292,000 [1]
Unrealized Losses 0 [1] (147,000) [1]
Fair Value 353,796,000 [1] 320,529,000 [1]
AFS Fixed Maturity Securities [Member] | Foreign Government [Member]
    
Cost/Amortized Cost 33,687,000 19,035,000
Unrealized Gains 1,042,000 280,000
Unrealized Losses (556,000) (349,000)
Fair Value 34,173,000 18,966,000
AFS Fixed Maturity Securities [Member] | Obligations of States and Political Subdivisions [Member]
    
Cost/Amortized Cost 578,214,000 512,013,000
Unrealized Gains 44,491,000 22,534,000
Unrealized Losses (46,000) (650,000)
Fair Value 622,659,000 533,897,000
AFS Fixed Maturity Securities [Member] | Corporate Securities [Member]
    
Cost/Amortized Cost 1,168,439,000 973,835,000
Unrealized Gains 50,167,000 28,674,000
Unrealized Losses (5,296,000) (8,784,000)
Fair Value 1,213,310,000 993,725,000
AFS Fixed Maturity Securities [Member] | Asset-backed Securities ("ABS") [Member]
    
Cost/Amortized Cost 77,706,000 48,558,000
Unrealized Gains 1,289,000 514,000
Unrealized Losses (46,000) (339,000)
Fair Value 78,949,000 48,733,000
AFS Fixed Maturity Securities [Member] | Commercial Mortgage-backed Securities ("CMBS") [Member]
    
Cost/Amortized Cost 107,838,000 [2] 103,374,000 [2]
Unrealized Gains 6,427,000 [2] 4,024,000 [2]
Unrealized Losses (1,667,000) [2] (2,923,000) [2]
Fair Value 112,598,000 [2] 104,475,000 [2]
Government guaranteed agency securities fair value 72,900,000 71,900,000
AFS Fixed Maturity Securities [Member] | Residential Mortgage Backed Securities ("RMBS") [Member]
    
Cost/Amortized Cost 467,468,000 [3] 316,789,000 [3]
Unrealized Gains 16,187,000 [3] 7,871,000 [3]
Unrealized Losses (1,767,000) [3] (2,243,000) [3]
Fair Value 481,888,000 [3] 322,417,000 [3]
Government guaranteed agency securities fair value 98,200,000 91,100,000
Equity Securities [Member]
    
Cost/Amortized Cost 143,826,000 58,039,000
Unrealized Gains 13,617,000 11,597,000
Unrealized Losses (88,000) 0
Fair Value $ 157,355,000 $ 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 $76.5 million at December 31, 2011 and $121.0 million at December 31, 2010.
[2] 2 CMBS includes government guaranteed agency securities with a fair value of $72.9 million at December 31, 2011 and $71.9 million at December 31, 2010.
[3] 3 RMBS includes government guaranteed agency securities with a fair value of $98.2 million at December 31, 2011 and $91.1 million at December 31, 2010.