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Investments (Available-For-Sale Securities Disclosure) (Details) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost $ 3,506,428,000 $ 3,263,124,000
Unrealized Gains 131,637,000 187,105,000
Unrealized Losses (46,190,000) (2,834,000)
Fair Value 3,591,875,000 3,447,395,000
AFS Fixed Maturity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 3,363,994,000 3,130,683,000
Unrealized Gains 101,242,000 167,705,000
Unrealized Losses (45,425,000) (2,375,000)
Fair Value 3,419,811,000 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 165,844,000 241,874,000
Unrealized Gains 12,519,000 17,219,000
Unrealized Losses (369,000) (1,000)
Fair Value 177,994,000 259,092,000
AFS Fixed Maturity Securities [Member] | Foreign Government [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 28,802,000 28,813,000
Unrealized Gains 995,000 1,540,000
Unrealized Losses (127,000) (124,000)
Fair Value 29,670,000 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 884,615,000 773,953,000
Unrealized Gains 28,521,000 44,398,000
Unrealized Losses (18,818,000) (327,000)
Fair Value 894,318,000 818,024,000
AFS Fixed Maturity Securities [Member] | Corporate Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 1,491,837,000 1,368,954,000
Unrealized Gains 46,984,000 81,696,000
Unrealized Losses (14,850,000) (402,000)
Fair Value 1,523,971,000 1,450,248,000
AFS Fixed Maturity Securities [Member] | Asset-backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 155,338,000 126,330,000
Unrealized Gains 999,000 2,319,000
Unrealized Losses (911,000) (9,000)
Fair Value 155,426,000 128,640,000
AFS Fixed Maturity Securities [Member] | Commercial Mortgage-backed Securities ("CMBS") [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 137,048,000 [1] 133,763,000 [1]
Unrealized Gains 2,318,000 [1] 4,572,000 [1]
Unrealized Losses (3,782,000) [1] (1,216,000) [1]
Fair Value 135,584,000 [1] 137,119,000 [1]
Government guaranteed agency securities fair value 39,900,000 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 500,510,000 [2] 456,996,000 [2]
Unrealized Gains 8,906,000 [2] 15,961,000 [2]
Unrealized Losses (6,568,000) [2] (296,000) [2]
Fair Value 502,848,000 [2] 472,661,000 [2]
Government guaranteed agency securities fair value 72,200,000 91,000,000
Equity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 142,434,000 132,441,000
Unrealized Gains 30,395,000 19,400,000
Unrealized Losses (765,000) (459,000)
Fair Value $ 172,064,000 $ 151,382,000
[1] CMBS includes government guaranteed agency securities with a fair value of $39.9 million at June 30, 2013 and $48.9 million at December 31, 2012.
[2] RMBS includes government guaranteed agency securities with a fair value of $72.2 million at June 30, 2013 and $91.0 million at December 31, 2012.