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Investments (Net Investment Income) (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Net investment income earned $ 34,593,000 $ 30,650,000 $ 34,006,000 $ 32,628,000 $ 28,839,000 $ 35,786,000 $ 39,345,000 $ 43,473,000 $ 131,877,000 $ 147,443,000 $ 145,708,000
Decrease In Net Investment Income Before Tax                 15,600,000    
Alternative Investments [Member]
                      
Decrease In Net Investment Income Before Tax                 10,300,000    
Fixed Maturity Securities [Member]
                      
Net investment income earned                 124,687,000 129,710,000 130,990,000
Decrease In Net Investment Income Before Tax                 5,000,000    
Equity Securities [Member]
                      
Net investment income earned                 6,215,000 4,535,000 2,238,000
Short-term Investments [Member]
                      
Net investment income earned                 151,000 160,000 437,000
Other Investment Portfolio [Member]
                      
Net investment income earned                 8,996,000 20,539,000 20,313,000
Miscellaneous Investment Income [Member]
                      
Net investment income earned                 0 133,000 139,000
Investment Expenses [Member]
                      
Net investment income earned                 (8,172,000) (7,634,000) (8,409,000)
Fixed Matuirty Securities Which Matured Or Were Sold [Member]
                      
Fixed Maturity Securities Amortized Cost 658,300,000       481,900,000       658,300,000 481,900,000  
Average Investment Portfolio Yield                 3.70% 3.80%  
Fixed Maturity Securities Which Were Purchased [Member]
                      
Fixed Maturity Securities Cost $ 892,600,000       $ 490,800,000       $ 892,600,000 $ 490,800,000  
Average Investment Portfolio Yield                 2.20% 2.70%