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Investments (Available-For-Sale Securities Disclosure) (Details) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost $ 3,219,607,000 $ 2,910,682,000
Unrealized Gains 208,389,000 153,512,000
Unrealized Losses (2,459,000) (9,466,000)
Fair Value 3,425,537,000 3,054,728,000
AFS Fixed Maturity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 3,091,740,000 2,766,856,000
Unrealized Gains 180,468,000 139,895,000
Unrealized Losses (2,248,000) (9,378,000)
Fair Value 3,269,960,000 2,897,373,000
AFS Fixed Maturity Securities [Member] | U.S. Government and Government Agencies [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 275,417,000 [1] 333,504,000 [1]
Unrealized Gains 18,797,000 [1] 20,292,000 [1]
Unrealized Losses 0 [1] 0 [1]
Fair Value 294,214,000 [1] 353,796,000 [1]
Corporate securities fully guaranteed by the Federal Deposit Insurance Corporation ("FDIC") 14,100,000 76,500,000
AFS Fixed Maturity Securities [Member] | Foreign Government [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 28,819,000 33,687,000
Unrealized Gains 1,664,000 1,042,000
Unrealized Losses (191,000) (556,000)
Fair Value 30,292,000 34,173,000
AFS Fixed Maturity Securities [Member] | Obligations of States and Political Subdivisions [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 737,985,000 578,214,000
Unrealized Gains 46,524,000 44,491,000
Unrealized Losses (8,000) (46,000)
Fair Value 784,501,000 622,659,000
AFS Fixed Maturity Securities [Member] | Corporate Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 1,340,366,000 1,168,439,000
Unrealized Gains 85,741,000 50,167,000
Unrealized Losses (219,000) (5,296,000)
Fair Value 1,425,888,000 1,213,310,000
AFS Fixed Maturity Securities [Member] | Asset-backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 118,923,000 77,706,000
Unrealized Gains 2,232,000 1,289,000
Unrealized Losses (1,000) (46,000)
Fair Value 121,154,000 78,949,000
AFS Fixed Maturity Securities [Member] | Commercial Mortgage-backed Securities ("CMBS") [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 126,043,000 [2] 107,838,000 [2]
Unrealized Gains 5,151,000 [2] 6,427,000 [2]
Unrealized Losses (1,579,000) [2] (1,667,000) [2]
Fair Value 129,615,000 [2] 112,598,000 [2]
Government guaranteed agency securities fair value 59,900,000 72,900,000
AFS Fixed Maturity Securities [Member] | Residential Mortgage Backed Securities ("RMBS") [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 464,187,000 [3] 467,468,000 [3]
Unrealized Gains 20,359,000 [3] 16,187,000 [3]
Unrealized Losses (250,000) [3] (1,767,000) [3]
Fair Value 484,296,000 [3] 481,888,000 [3]
Government guaranteed agency securities fair value 98,100,000 98,200,000
Equity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 127,867,000 143,826,000
Unrealized Gains 27,921,000 13,617,000
Unrealized Losses (211,000) (88,000)
Fair Value $ 155,577,000 $ 157,355,000
[1] 1 U.S. government includes corporate securities fully guaranteed by the Federal Deposit Insurance Corporation (“FDIC”) with a fair value of $14.1 million at September 30, 2012 and $76.5 million at December 31, 2011.
[2] 2 CMBS includes government guaranteed agency securities with a fair value of $59.9 million at September 30, 2012 and $72.9 million at December 31, 2011.
[3] 3 RMBS includes government guaranteed agency securities with a fair value of $98.1 million at September 30, 2012 and $98.2 million at December 31, 2011.