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Investments (Available-For-Sale Securities Disclosure) (Details) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost $ 3,910,826,000 $ 3,831,327,000
Unrealized Gains 134,079,000 128,951,000
Unrealized Losses (31,365,000) (51,971,000)
Fair Value 4,013,540,000 3,908,307,000
AFS Fixed Income Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 3,748,456,000 3,675,977,000
Unrealized Gains 98,645,000 91,434,000
Unrealized Losses (31,248,000) (51,875,000)
Fair Value 3,815,853,000 3,715,536,000
AFS Fixed Income Securities [Member] | U.S. Government and Government Agencies [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 161,428,000 163,218,000
Unrealized Gains 10,007,000 10,661,000
Unrealized Losses (370,000) (504,000)
Fair Value 171,065,000 173,375,000
AFS Fixed Income Securities [Member] | Foreign Government [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 31,538,000 29,781,000
Unrealized Gains 912,000 906,000
Unrealized Losses (29,000) (72,000)
Fair Value 32,421,000 30,615,000
AFS Fixed Income Securities [Member] | Obligations of States and Political Subdivisions [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 963,237,000 946,455,000
Unrealized Gains 26,617,000 25,194,000
Unrealized Losses (10,687,000) (20,025,000)
Fair Value 979,167,000 951,624,000
AFS Fixed Income Securities [Member] | Corporate Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 1,777,186,000 1,707,928,000
Unrealized Gains 48,305,000 44,004,000
Unrealized Losses (9,793,000) (17,049,000)
Fair Value 1,815,698,000 1,734,883,000
AFS Fixed Income Securities [Member] | Asset-backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 131,386,000 140,430,000
Unrealized Gains 908,000 934,000
Unrealized Losses (360,000) (468,000)
Fair Value 131,934,000 140,896,000
AFS Fixed Income Securities [Member] | Commercial Mortgage-backed Securities (CMBS) [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 172,386,000 [1] 172,288,000 [1]
Unrealized Gains 4,686,000 [1] 2,462,000 [1]
Unrealized Losses (2,256,000) [1] (3,466,000) [1]
Fair Value 174,816,000 [1] 171,284,000 [1]
Government guaranteed agency securities fair value 24,500,000 30,000,000
AFS Fixed Income Securities [Member] | Residential Mortgage Backed Securities (RMBS) [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 511,295,000 [2] 515,877,000 [2]
Unrealized Gains 7,210,000 [2] 7,273,000 [2]
Unrealized Losses (7,753,000) [2] (10,291,000) [2]
Fair Value 510,752,000 [2] 512,859,000 [2]
Government guaranteed agency securities fair value 48,200,000 55,200,000
Equity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 162,370,000 155,350,000
Unrealized Gains 35,434,000 37,517,000
Unrealized Losses (117,000) (96,000)
Fair Value $ 197,687,000 $ 192,771,000
[1] CMBS includes government guaranteed agency securities with a fair value of $24.5 million at March 31, 2014 and $30.0 million at December 31, 2013.
[2] RMBS includes government guaranteed agency securities with a fair value of $48.2 million at March 31, 2014 and $55.2 million at December 31, 2013.