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Investments (Available-For-Sale Securities Disclosure) (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost $ 3,263,124,000 $ 2,910,682,000
Unrealized Gains 187,105,000 153,512,000
Unrealized Losses (2,834,000) (9,466,000)
Fair Value 3,447,395,000 3,054,728,000
AFS Fixed Maturity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 3,130,683,000 2,766,856,000
Unrealized Gains 167,705,000 139,895,000
Unrealized Losses (2,375,000) (9,378,000)
Fair Value 3,296,013,000 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 241,874,000 333,504,000 [1]
Unrealized Gains 17,219,000 20,292,000 [1]
Unrealized Losses (1,000) 0 [1]
Fair Value 259,092,000 353,796,000 [1]
Corporate securities fully guaranteed by the Federal Deposit Insurance Corporation ("FDIC")   76,500,000
AFS Fixed Maturity Securities [Member] | Foreign Government [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 28,813,000 33,687,000
Unrealized Gains 1,540,000 1,042,000
Unrealized Losses (124,000) (556,000)
Fair Value 30,229,000 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 773,953,000 578,214,000
Unrealized Gains 44,398,000 44,491,000
Unrealized Losses (327,000) (46,000)
Fair Value 818,024,000 622,659,000
AFS Fixed Maturity Securities [Member] | Corporate Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 1,368,954,000 1,168,439,000
Unrealized Gains 81,696,000 50,167,000
Unrealized Losses (402,000) (5,296,000)
Fair Value 1,450,248,000 1,213,310,000
AFS Fixed Maturity Securities [Member] | Asset-backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 126,330,000 77,706,000
Unrealized Gains 2,319,000 1,289,000
Unrealized Losses (9,000) (46,000)
Fair Value 128,640,000 78,949,000
AFS Fixed Maturity Securities [Member] | Commercial Mortgage Backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 133,763,000 [2] 107,838,000 [2]
Unrealized Gains 4,572,000 [2] 6,427,000 [2]
Unrealized Losses (1,216,000) [2] (1,667,000) [2]
Fair Value 137,119,000 [2] 112,598,000 [2]
Government guaranteed agency securities fair value 48,900,000 72,900,000
AFS Fixed Maturity Securities [Member] | Residential Mortgage Backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 456,996,000 [3] 467,468,000 [3]
Unrealized Gains 15,961,000 [3] 16,187,000 [3]
Unrealized Losses (296,000) [3] (1,767,000) [3]
Fair Value 472,661,000 [3] 481,888,000 [3]
Government guaranteed agency securities fair value 91,000,000 98,200,000
Equity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 132,441,000 143,826,000
Unrealized Gains 19,400,000 13,617,000
Unrealized Losses (459,000) (88,000)
Fair Value $ 151,382,000 $ 157,355,000
[1] 3 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.
[2] 1 CMBS includes government guaranteed agency securities with a fair value of $48.9 million at December 31, 2012 and $72.9 million at December 31, 2011.
[3] RMBS includes government guaranteed agency securities with a fair value of $91.0 million at December 31, 2012 and $98.2 million at December 31, 2011.