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Investments (Available-For-Sale Securities Disclosure) (Details) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost $ 3,458,553,000 $ 3,263,124,000
Unrealized Gains 186,266,000 187,105,000
Unrealized Losses (4,093,000) (2,834,000)
Fair Value 3,640,726,000 3,447,395,000
AFS Fixed Maturity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 3,314,989,000 3,130,683,000
Unrealized Gains 154,644,000 167,705,000
Unrealized Losses (3,652,000) (2,375,000)
Fair Value 3,465,981,000 3,296,013,000
AFS Fixed Maturity Securities [Member] | U.S. Government and Government Agencies [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 229,718,000 241,874,000
Unrealized Gains 15,950,000 17,219,000
Unrealized Losses (4,000) (1,000)
Fair Value 245,664,000 259,092,000
AFS Fixed Maturity Securities [Member] | Foreign Government [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 28,808,000 28,813,000
Unrealized Gains 1,472,000 1,540,000
Unrealized Losses (116,000) (124,000)
Fair Value 30,164,000 30,229,000
AFS Fixed Maturity Securities [Member] | Obligations of States and Political Subdivisions [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 810,375,000 773,953,000
Unrealized Gains 40,630,000 44,398,000
Unrealized Losses (1,059,000) (327,000)
Fair Value 849,946,000 818,024,000
AFS Fixed Maturity Securities [Member] | Corporate Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 1,456,347,000 1,368,954,000
Unrealized Gains 77,266,000 81,696,000
Unrealized Losses (860,000) (402,000)
Fair Value 1,532,753,000 1,450,248,000
AFS Fixed Maturity Securities [Member] | Asset-backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 170,026,000 126,330,000
Unrealized Gains 1,971,000 2,319,000
Unrealized Losses (55,000) (9,000)
Fair Value 171,942,000 128,640,000
AFS Fixed Maturity Securities [Member] | Commercial Mortgage-backed Securities ("CMBS") [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 144,120,000 [1] 133,763,000 [1]
Unrealized Gains 3,523,000 [1] 4,572,000 [1]
Unrealized Losses (1,103,000) [1] (1,216,000) [1]
Fair Value 146,540,000 [1] 137,119,000 [1]
Government guaranteed agency securities fair value 42,300,000 48,900,000
AFS Fixed Maturity Securities [Member] | Residential Mortgage Backed Securities ("RMBS") [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 475,595,000 [2] 456,996,000 [2]
Unrealized Gains 13,832,000 [2] 15,961,000 [2]
Unrealized Losses (455,000) [2] (296,000) [2]
Fair Value 488,972,000 [2] 472,661,000 [2]
Government guaranteed agency securities fair value 85,000,000 91,000,000
Equity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 143,564,000 132,441,000
Unrealized Gains 31,622,000 19,400,000
Unrealized Losses (441,000) (459,000)
Fair Value $ 174,745,000 $ 151,382,000
[1] CMBS includes government guaranteed agency securities with a fair value of $42.3 million at March 31, 2013 and $48.9 million at December 31, 2012.
[2] RMBS includes government guaranteed agency securities with a fair value of $85.0 million at March 31, 2013 and $91.0 million at December 31, 2012.