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Investments (Held-To-Maturity Securities Disclosure) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Securities
Dec. 31, 2011
Dec. 31, 2010
Amortized Cost $ 550,143,000 $ 706,782,000  
Net Unrealized Gains (Losses) 3,926,000 5,566,000  
Held-to-maturity Securities 554,069,000 712,348,000  
Unrecognized Holding Gains 40,615,000 45,946,000  
Unrecognized Holding Losses (23,000) (251,000)  
Fair Value 594,661,000 758,043,000  
Held To Maturity Securities Average Duration 2 years 6 months    
Number of held to maturity securities transferred to available-for-sale 10    
Securities reclassified from the HTM category to AFS carrying value 32,700,000    
Securities reclassified from the HTM category to AFS net unrecognized gain 2,400,000    
Redemption and maturities of fixed maturity securities, held-to-maturity 118,260,000 177,350,000 319,835,000
Foreign Government [Member]
      
Amortized Cost 5,292,000 5,292,000  
Net Unrealized Gains (Losses) 212,000 292,000  
Held-to-maturity Securities 5,504,000 5,584,000  
Unrecognized Holding Gains 367,000 0  
Unrecognized Holding Losses 0 (88,000)  
Fair Value 5,871,000 5,496,000  
Obligations of States and Political Subdivisions [Member]
      
Amortized Cost 491,180,000 614,118,000  
Net Unrealized Gains (Losses) 6,769,000 11,894,000  
Held-to-maturity Securities 497,949,000 626,012,000  
Unrecognized Holding Gains 28,996,000 31,529,000  
Unrecognized Holding Losses (23,000) (156,000)  
Fair Value 526,922,000 657,385,000  
Corporate Securities [Member]
      
Amortized Cost 38,285,000 64,840,000  
Net Unrealized Gains (Losses) (812,000) (2,189,000)  
Held-to-maturity Securities 37,473,000 62,651,000  
Unrecognized Holding Gains 4,648,000 6,887,000  
Unrecognized Holding Losses 0 0  
Fair Value 42,121,000 69,538,000  
Asset-backed Securities [Member]
      
Amortized Cost 6,980,000 8,077,000  
Net Unrealized Gains (Losses) (1,052,000) (1,469,000)  
Held-to-maturity Securities 5,928,000 6,608,000  
Unrecognized Holding Gains 1,170,000 1,353,000  
Unrecognized Holding Losses 0 (7,000)  
Fair Value 7,098,000 7,954,000  
Commercial Mortgage Backed Securities [Member]
      
Amortized Cost 8,406,000 14,455,000  
Net Unrealized Gains (Losses) (1,191,000) (2,962,000)  
Held-to-maturity Securities 7,215,000 11,493,000  
Unrecognized Holding Gains 5,434,000 6,177,000  
Unrecognized Holding Losses 0 0  
Fair Value $ 12,649,000 $ 17,670,000