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Investments (Available-For-Sale Securities Disclosure) (Details) (USD $)
Sep. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost $ 4,064,671,000 $ 3,831,327,000
Unrealized Gains 133,475,000 128,951,000
Unrealized Losses (19,242,000) (51,971,000)
Total AFS securities 4,178,904,000 3,908,307,000
AFS Fixed Income Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 3,884,252,000 3,675,977,000
Unrealized Gains 98,678,000 91,434,000
Unrealized Losses (15,292,000) (51,875,000)
Total AFS securities 3,967,638,000 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 143,742,000 163,218,000
Unrealized Gains 8,210,000 10,661,000
Unrealized Losses (263,000) (504,000)
Total AFS securities 151,689,000 173,375,000
AFS Fixed Income Securities [Member] | Foreign Government [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 27,041,000 29,781,000
Unrealized Gains 832,000 906,000
Unrealized Losses (6,000) (72,000)
Total AFS securities 27,867,000 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 1,196,478,000 946,455,000
Unrealized Gains 34,533,000 25,194,000
Unrealized Losses (1,777,000) (20,025,000)
Total AFS securities 1,229,234,000 951,624,000
AFS Fixed Income Securities [Member] | Corporate Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 1,725,290,000 1,707,928,000
Unrealized Gains 44,571,000 44,004,000
Unrealized Losses (6,631,000) (17,049,000)
Total AFS securities 1,763,230,000 1,734,883,000
AFS Fixed Income Securities [Member] | Asset-Backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 146,557,000 140,430,000
Unrealized Gains 791,000 934,000
Unrealized Losses (382,000) (468,000)
Total AFS securities 146,966,000 140,896,000
AFS Fixed Income Securities [Member] | Commercial Mortgage Backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 164,934,000 [1] 172,288,000 [1]
Unrealized Gains 2,077,000 [1] 2,462,000 [1]
Unrealized Losses (1,493,000) [1] (3,466,000) [1]
Total AFS securities 165,518,000 [1] 171,284,000 [1]
Government guaranteed agency securities fair value 17,600,000 30,000,000
AFS Fixed Income Securities [Member] | Residential Mortgage Backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 480,210,000 [2] 515,877,000 [2]
Unrealized Gains 7,664,000 [2] 7,273,000 [2]
Unrealized Losses (4,740,000) [2] (10,291,000) [2]
Total AFS securities 483,134,000 [2] 512,859,000 [2]
Government guaranteed agency securities fair value 35,900,000 55,200,000
Equity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 180,419,000 155,350,000
Unrealized Gains 34,797,000 37,517,000
Unrealized Losses (3,950,000) (96,000)
Total AFS securities $ 211,266,000 $ 192,771,000
[1] CMBS includes government guaranteed agency securities with a fair value of $17.6 million at September 30, 2014 and $30.0 million at December 31, 2013.
[2] RMBS includes government guaranteed agency securities with a fair value of $35.9 million at September 30, 2014 and $55.2 million at December 31, 2013.