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Investments (Net Investment Income) (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Net investment income earned $ 28,839,000 $ 35,786,000 $ 39,345,000 $ 43,473,000 $ 41,471,000 $ 32,986,000 $ 36,545,000 $ 34,706,000 $ 147,443,000 $ 145,708,000 $ 118,471,000
Fixed Maturity Securities [Member]
                      
Net investment income earned                 129,710,000 130,990,000 141,882,000
Decrease In Net Investment Income Before Tax                   10,900,000  
Equity Securities [Member]
                      
Net investment income earned                 4,535,000 2,238,000 2,348,000
Trading Securities [Member]
                      
Net investment income earned                 0 0 262,000
Short-term Investments [Member]
                      
Net investment income earned                 160,000 437,000 1,273,000
Other Investments [Member]
                      
Net investment income earned                 20,539,000 20,313,000 (21,726,000)
Miscellaneous Investment Income [Member]
                      
Net investment income earned                 133,000 139,000 343,000
Investment Expenses [Member]
                      
Net investment income earned                 (7,634,000) (8,409,000) (5,911,000)
Fixed Matuirty Securities Which Matured Or Were Sold [Member]
                      
Fixed Maturity Securities Amortized Cost 481,900,000       808,300,000       481,900,000 808,300,000  
Average Investment Portfolio Yield                 3.80% 3.80%  
Fixed Maturity Securities Which Were Purchased [Member]
                      
Fixed Maturity Securities Cost $ 490,800,000       $ 1,000,000,000       $ 490,800,000 $ 1,000,000,000  
Average Investment Portfolio Yield                 2.70% 2.80%