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Investments (Available-For-Sale Securities Disclosure) (Details) (USD $)
Sep. 30, 2011
Dec. 31, 2010
Cost/Amortized Cost$ 2,799,552,000$ 2,344,027,000
Unrealized Gains139,413,00083,786,000
Unrealized Losses(27,414,000)(15,435,000)
Fair Value2,911,551,0002,412,378,000
Corporate securities fully guaranteed by the Federal Deposit Insurance Corporation ("FDIC")96,300,000121,000,000
AFS Fixed Maturity Securities [Member]
  
Cost/Amortized Cost2,649,035,0002,285,988,000
Unrealized Gains132,723,00072,189,000
Unrealized Losses(9,410,000)(15,435,000)
Fair Value2,772,348,0002,342,742,000
AFS Fixed Maturity Securities [Member] | U.S. Government and Government Agencies [Member]
  
Cost/Amortized Cost358,154,000[1]312,384,000[1]
Unrealized Gains21,877,000[1]8,292,000[1]
Unrealized Losses0[1](147,000)[1]
Fair Value380,031,000[1]320,529,000[1]
AFS Fixed Maturity Securities [Member] | Foreign Government [Member]
  
Cost/Amortized Cost31,599,00019,035,000
Unrealized Gains1,313,000280,000
Unrealized Losses0(349,000)
Fair Value32,912,00018,966,000
AFS Fixed Maturity Securities [Member] | Obligations of States and Political Subdivisions [Member]
  
Cost/Amortized Cost524,185,000512,013,000
Unrealized Gains37,375,00022,534,000
Unrealized Losses(45,000)(650,000)
Fair Value561,515,000533,897,000
AFS Fixed Maturity Securities [Member] | Corporate Securities [Member]
  
Cost/Amortized Cost1,085,081,000973,835,000
Unrealized Gains46,011,00028,674,000
Unrealized Losses(5,533,000)(8,784,000)
Fair Value1,125,559,000993,725,000
AFS Fixed Maturity Securities [Member] | Asset-backed Securities ("ABS") [Member]
  
Cost/Amortized Cost78,393,00048,558,000
Unrealized Gains1,383,000514,000
Unrealized Losses(1,082,000)(339,000)
Fair Value78,694,00048,733,000
AFS Fixed Maturity Securities [Member] | Commercial Mortgage-backed Securities ("CMBS") [Member]
  
Cost/Amortized Cost107,404,000[2]103,374,000[2]
Unrealized Gains6,788,000[2]4,024,000[2]
Unrealized Losses(1,301,000)[2](2,923,000)[2]
Fair Value112,891,000[2]104,475,000[2]
Government guaranteed agency securities fair value78,000,00071,900,000
AFS Fixed Maturity Securities [Member] | Residential Mortgage Backed Securities ("RMBS") [Member]
  
Cost/Amortized Cost464,219,000[3]316,789,000[3]
Unrealized Gains17,976,000[3]7,871,000[3]
Unrealized Losses(1,449,000)[3](2,243,000)[3]
Fair Value480,746,000[3]322,417,000[3]
Government guaranteed agency securities fair value101,300,00091,100,000
Equity Securities [Member]
  
Cost/Amortized Cost150,517,00058,039,000
Unrealized Gains6,690,00011,597,000
Unrealized Losses(18,004,000)0
Fair Value$ 139,203,000$ 69,636,000
[1] 1 U.S. government includes corporate securities fully guaranteed by the Federal Deposit Insurance Corporation ("FDIC") with a fair value of $96.3 million at September 30, 2011 and $121.0 million at December 31, 2010.
[2] 2 CMBS includes government guaranteed agency securities with a fair value of $78.0 million at September 30, 2011 and $71.9 million at December 31, 2010.
[3] 3 RMBS includes government guaranteed agency securities with a fair value of $101.3 million at September 30, 2011 and $91.1 million at December 31, 2010.