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Investments (Available-For-Sale Securities Disclosure) (Details) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost $ 3,732,074,000 $ 3,263,124,000
Unrealized gains 125,389,000 187,105,000
Unrealized Losses (43,525,000) (2,834,000)
Fair Value 3,813,938,000 3,447,395,000
AFS Fixed Maturity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 3,573,751,000 3,130,683,000
Unrealized gains 101,328,000 167,705,000
Unrealized Losses (41,647,000) (2,375,000)
Fair Value 3,633,432,000 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 169,163,000 241,874,000
Unrealized gains 11,953,000 17,219,000
Unrealized Losses (330,000) (1,000)
Fair Value 180,786,000 259,092,000
AFS Fixed Maturity Securities [Member] | Foreign Government [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 28,797,000 28,813,000
Unrealized gains 996,000 1,540,000
Unrealized Losses (84,000) (124,000)
Fair Value 29,709,000 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 918,403,000 773,953,000
Unrealized gains 27,705,000 44,398,000
Unrealized Losses (16,610,000) (327,000)
Fair Value 929,498,000 818,024,000
AFS Fixed Maturity Securities [Member] | Corporate Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 1,629,698,000 1,368,954,000
Unrealized gains 47,932,000 81,696,000
Unrealized Losses (14,479,000) (402,000)
Fair Value 1,663,151,000 1,450,248,000
AFS Fixed Maturity Securities [Member] | Asset-backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 150,179,000 126,330,000
Unrealized gains 1,063,000 2,319,000
Unrealized Losses (476,000) (9,000)
Fair Value 150,766,000 128,640,000
AFS Fixed Maturity Securities [Member] | Commercial Mortgage-backed Securities (CMBS) [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 152,464,000 [1] 133,763,000 [1]
Unrealized gains 2,747,000 [1] 4,572,000 [1]
Unrealized Losses (3,263,000) [1] (1,216,000) [1]
Fair Value 151,948,000 [1] 137,119,000 [1]
Government guaranteed agency securities fair value 35,500,000 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 525,047,000 [2] 456,996,000 [2]
Unrealized gains 8,932,000 [2] 15,961,000 [2]
Unrealized Losses (6,405,000) [2] (296,000) [2]
Fair Value 527,574,000 [2] 472,661,000 [2]
Government guaranteed agency securities fair value 61,400,000 91,000,000
Equity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost/Amortized Cost 158,323,000 132,441,000
Unrealized gains 24,061,000 19,400,000
Unrealized Losses (1,878,000) (459,000)
Fair Value $ 180,506,000 $ 151,382,000
[1] CMBS includes government guaranteed agency securities with a fair value of $35.5 million at September 30, 2013 and $48.9 million at December 31, 2012.
[2] RMBS includes government guaranteed agency securities with a fair value of $61.4 million at September 30, 2013 and $91.0 million at December 31, 2012.