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Investments (Held-To-Maturity Securities Disclosure) (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
years
securities
Dec. 31, 2010
Dec. 31, 2009
Amortized Cost $ 706,782,000 $ 1,199,801,000  
Net Unrealized Gains (Losses) 5,566,000 14,523,000  
Carrying Value 712,348,000 1,214,324,000  
Unrecognized Holding Gains 45,946,000 43,998,000  
Unrecognized Holding Losses (251,000) (2,028,000)  
Fair Value 758,043,000 1,256,294,000  
Held To Maturity securities average duration 2.9    
Number of held to maturity securities transferred to available-for-sale 105    
Securities reclassified from the HTM category to AFS carrying value 323,100,000    
Securities reclassified from the HTM category to AFS net unrecognized gain 18,700,000    
Redemption and maturities of fixed maturity securities, held-to-maturity 177,350,000 319,835,000 282,310,000
U.S. Government and Government Agencies [Member]
      
Amortized Cost   93,411,000  
Net Unrealized Gains (Losses)   4,695,000  
Carrying Value   98,106,000  
Unrecognized Holding Gains   5,023,000  
Unrecognized Holding Losses   0  
Fair Value   103,129,000  
Foreign Government [Member]
      
Amortized Cost 5,292,000 5,292,000  
Net Unrealized Gains (Losses) 292,000 368,000  
Carrying Value 5,584,000 5,660,000  
Unrecognized Holding Gains 0 0  
Unrecognized Holding Losses (88,000) (30,000)  
Fair Value 5,496,000 5,630,000  
Obligations of States and Political Subdivisions [Member]
      
Amortized Cost 614,118,000 874,388,000  
Net Unrealized Gains (Losses) 11,894,000 22,183,000  
Carrying Value 626,012,000 896,571,000  
Unrecognized Holding Gains 31,529,000 16,845,000  
Unrecognized Holding Losses (156,000) (1,132,000)  
Fair Value 657,385,000 912,284,000  
Corporate Securities [Member]
      
Amortized Cost 64,840,000 76,663,000  
Net Unrealized Gains (Losses) (2,189,000) (3,990,000)  
Carrying Value 62,651,000 72,673,000  
Unrecognized Holding Gains 6,887,000 9,705,000  
Unrecognized Holding Losses 0 (313,000)  
Fair Value 69,538,000 82,065,000  
Asset-backed Securities ("ABS") [Member]
      
Amortized Cost 8,077,000 12,947,000  
Net Unrealized Gains (Losses) (1,469,000) (2,422,000)  
Carrying Value 6,608,000 10,525,000  
Unrecognized Holding Gains 1,353,000 1,847,000  
Unrecognized Holding Losses (7,000) (444,000)  
Fair Value 7,954,000 11,928,000  
Commercial Mortgage-backed Securities ("CMBS") [Member]
      
Amortized Cost 14,455,000 54,909,000 [1]  
Net Unrealized Gains (Losses) (2,962,000) (7,354,000) [1]  
Carrying Value 11,493,000 47,555,000 [1]  
Unrecognized Holding Gains 6,177,000 7,483,000 [1]  
Unrecognized Holding Losses 0 (109,000) [1]  
Fair Value 17,670,000 54,929,000 [1]  
Government Guaranteed Agency Securities Carrying Value   8,900,000  
Residential Mortgage Backed Securities ("RMBS") [Member]
      
Amortized Cost   82,191,000 [2]  
Net Unrealized Gains (Losses)   1,043,000 [2]  
Carrying Value   83,234,000 [2]  
Unrecognized Holding Gains   3,095,000 [2]  
Unrecognized Holding Losses   0 [2]  
Fair Value   86,329,000 [2]  
Government Guaranteed Agency Securities Carrying Value   $ 4,000,000  
[1] 1 CMBS includes government guaranteed agency securities with a carrying value $8.9 million at December 31, 2010.
[2] 2 RMBS includes government guaranteed agency securities with a carrying value $4.0 million at December 31, 2010.