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Investments (Available-For-Sale Securities Disclosure) (Details) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost $ 3,831,327,000 $ 3,263,124,000
Unrealized Gains 128,951,000 187,105,000
Unrealized Losses (51,971,000) (2,834,000)
Fair Value 3,908,307,000 3,447,395,000
AFS Fixed Maturity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 3,675,977,000 3,130,683,000
Unrealized Gains 91,434,000 167,705,000
Unrealized Losses (51,875,000) (2,375,000)
Fair Value 3,715,536,000 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 163,218,000 241,874,000
Unrealized Gains 10,661,000 17,219,000
Unrealized Losses (504,000) (1,000)
Fair Value 173,375,000 259,092,000
AFS Fixed Maturity Securities [Member] | Foreign Government [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 29,781,000 28,813,000
Unrealized Gains 906,000 1,540,000
Unrealized Losses (72,000) (124,000)
Fair Value 30,615,000 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 946,455,000 773,953,000
Unrealized Gains 25,194,000 44,398,000
Unrealized Losses (20,025,000) (327,000)
Fair Value 951,624,000 818,024,000
AFS Fixed Maturity Securities [Member] | Corporate Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 1,707,928,000 1,368,954,000
Unrealized Gains 44,004,000 81,696,000
Unrealized Losses (17,049,000) (402,000)
Fair Value 1,734,883,000 1,450,248,000
AFS Fixed Maturity Securities [Member] | Asset-backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 140,430,000 126,330,000
Unrealized Gains 934,000 2,319,000
Unrealized Losses (468,000) (9,000)
Fair Value 140,896,000 128,640,000
AFS Fixed Maturity Securities [Member] | Commercial Mortgage Backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 172,288,000 [1] 133,763,000 [1]
Unrealized Gains 2,462,000 [1] 4,572,000 [1]
Unrealized Losses (3,466,000) [1] (1,216,000) [1]
Fair Value 171,284,000 [1] 137,119,000 [1]
Government guaranteed agency securities fair value 30,000,000 48,900,000
AFS Fixed Maturity Securities [Member] | Residential Mortgage Backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 515,877,000 [2] 456,996,000 [2]
Unrealized Gains 7,273,000 [2] 15,961,000 [2]
Unrealized Losses (10,291,000) [2] (296,000) [2]
Fair Value 512,859,000 [2] 472,661,000 [2]
Government guaranteed agency securities fair value 55,200,000 91,000,000
Equity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 155,350,000 132,441,000
Unrealized Gains 37,517,000 19,400,000
Unrealized Losses (96,000) (459,000)
Fair Value $ 192,771,000 $ 151,382,000
[1] CMBS includes government guaranteed agency securities with a fair value of $30.0 million at December 31, 2013 and $48.9 million at December 31, 2012
[2] RMBS includes government guaranteed agency securities with a fair value of $55.2 million at December 31, 2013 and $91.0 million at December 31, 2012.