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Investments (Available-For-Sale Securities Disclosure) (Details) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost $ 3,105,076,000 $ 2,910,682,000
Unrealized Gains 174,432,000 153,512,000
Unrealized Losses (8,385,000) (9,466,000)
Fair Value 3,271,123,000 3,054,728,000
Corporate securities fully guaranteed by the Federal Deposit Insurance Corporation ("FDIC") 14,200,000 76,500,000
Commercial Mortgage-backed Securities ("CMBS") [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Government guaranteed agency securities fair value 67,000,000 72,900,000
Residential Mortgage Backed Securities ("RMBS") [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Government guaranteed agency securities fair value 102,600,000 98,200,000
AFS Fixed Maturity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 2,974,819,000 2,766,856,000
Unrealized Gains 153,785,000 139,895,000
Unrealized Losses (5,598,000) (9,378,000)
Fair Value 3,123,006,000 2,897,373,000
AFS Fixed Maturity Securities [Member] | U.S. Government and Government Agencies [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 268,949,000 [1] 333,504,000 [1]
Unrealized Gains 19,050,000 [1] 20,292,000 [1]
Unrealized Losses (3,000) [1] 0 [1]
Fair Value 287,996,000 [1] 353,796,000 [1]
AFS Fixed Maturity Securities [Member] | Foreign Government [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 41,557,000 33,687,000
Unrealized Gains 1,537,000 1,042,000
Unrealized Losses (312,000) (556,000)
Fair Value 42,782,000 34,173,000
AFS Fixed Maturity Securities [Member] | Obligations of States and Political Subdivisions [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 695,158,000 578,214,000
Unrealized Gains 42,307,000 44,491,000
Unrealized Losses (964,000) (46,000)
Fair Value 736,501,000 622,659,000
AFS Fixed Maturity Securities [Member] | Corporate Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 1,283,114,000 1,168,439,000
Unrealized Gains 66,588,000 50,167,000
Unrealized Losses (955,000) (5,296,000)
Fair Value 1,348,747,000 1,213,310,000
AFS Fixed Maturity Securities [Member] | Asset-backed Securities ("ABS") [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 93,031,000 77,706,000
Unrealized Gains 1,785,000 1,289,000
Unrealized Losses (7,000) (46,000)
Fair Value 94,809,000 78,949,000
AFS Fixed Maturity Securities [Member] | Commercial Mortgage-backed Securities ("CMBS") [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 115,965,000 [2] 107,838,000 [2]
Unrealized Gains 4,882,000 [2] 6,427,000 [2]
Unrealized Losses (2,804,000) [2] (1,667,000) [2]
Fair Value 118,043,000 [2] 112,598,000 [2]
AFS Fixed Maturity Securities [Member] | Residential Mortgage Backed Securities ("RMBS") [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 477,045,000 [3] 467,468,000 [3]
Unrealized Gains 17,636,000 [3] 16,187,000 [3]
Unrealized Losses (553,000) [3] (1,767,000) [3]
Fair Value 494,128,000 [3] 481,888,000 [3]
Equity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 130,257,000 143,826,000
Unrealized Gains 20,647,000 13,617,000
Unrealized Losses (2,787,000) (88,000)
Fair Value $ 148,117,000 $ 157,355,000
[1] 1 U.S. government includes corporate securities fully guaranteed by the Federal Deposit Insurance Corporation (“FDIC”) with a fair value of $14.2 million at June 30, 2012 and $76.5 million at December 31, 2011.
[2] 2 CMBS includes government guaranteed agency securities with a fair value of $67.0 million at June 30, 2012 and $72.9 million at December 31, 2011.
[3] 3 RMBS includes government guaranteed agency securities with a fair value of $102.6 million at June 30, 2012 and $98.2 million at December 31, 2011.