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Investments (Available-For-Sale Securities Disclosure) (Details) (USD $)
Mar. 31, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost $ 3,027,735,000 $ 2,910,682,000
Unrealized Gains 166,913,000 153,512,000
Unrealized Losses (7,151,000) (9,466,000)
Fair Value 3,187,497,000 3,054,728,000
AFS Fixed Maturity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 2,897,522,000 2,766,856,000
Unrealized Gains 143,747,000 139,895,000
Unrealized Losses (6,758,000) (9,378,000)
Fair Value 3,034,511,000 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 316,520,000 [1] 333,504,000 [1]
Unrealized Gains 18,764,000 [1] 20,292,000 [1]
Unrealized Losses (104,000) [1] 0 [1]
Fair Value 335,180,000 [1] 353,796,000 [1]
Corporate securities fully guaranteed by the Federal Deposit Insurance Corporation ("FDIC") 61,500,000 76,500,000
AFS Fixed Maturity Securities [Member] | Foreign Government [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 36,903,000 33,687,000
Unrealized Gains 1,252,000 1,042,000
Unrealized Losses (338,000) (556,000)
Fair Value 37,817,000 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 628,968,000 578,214,000
Unrealized Gains 41,622,000 44,491,000
Unrealized Losses (1,517,000) (46,000)
Fair Value 669,073,000 622,659,000
AFS Fixed Maturity Securities [Member] | Corporate Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 1,236,899,000 1,168,439,000
Unrealized Gains 59,389,000 50,167,000
Unrealized Losses (1,343,000) (5,296,000)
Fair Value 1,294,945,000 1,213,310,000
AFS Fixed Maturity Securities [Member] | Asset-backed Securities ("ABS") [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 93,390,000 77,706,000
Unrealized Gains 1,408,000 1,289,000
Unrealized Losses (56,000) (46,000)
Fair Value 94,742,000 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 109,931,000 [2] 107,838,000 [2]
Unrealized Gains 4,686,000 [2] 6,427,000 [2]
Unrealized Losses (2,569,000) [2] (1,667,000) [2]
Fair Value 112,048,000 [2] 112,598,000 [2]
Government guaranteed agency securities fair value 68,400,000 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 474,911,000 [3] 467,468,000 [3]
Unrealized Gains 16,626,000 [3] 16,187,000 [3]
Unrealized Losses (831,000) [3] (1,767,000) [3]
Fair Value 490,706,000 [3] 481,888,000 [3]
Government guaranteed agency securities fair value 102,800,000 98,200,000
Equity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 130,213,000 143,826,000
Unrealized Gains 23,166,000 13,617,000
Unrealized Losses (393,000) (88,000)
Fair Value $ 152,986,000 $ 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 $61.5 million at March 31, 2012 and $76.5 million at December 31, 2011.
[2] 2 CMBS includes government guaranteed agency securities with a fair value of $68.4 million at March 31, 2012 and $72.9 million at December 31, 2011.
[3] 3 RMBS includes government guaranteed agency securities with a fair value of $102.8 million at March 31, 2012 and $98.2 million at December 31, 2011.