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Schedule II Condensed Financial Information of Registrant (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
ASSETS      
Other assets $ 217,886 $ 212,593  
Total assets 8,167,726 7,435,169 6,945,662
LIABILITIES AND SHAREHOLDERS' EQUITY      
Long-term debt 199,809 199,744  
Other liabilities 445,952 352,800 287,252
Total liabilities 6,921,923 6,379,816 6,098,575
Preferred stock, $0.001 par value, authorized 1,000,000 shares; none issued        
Common stock, $0.001 par value, authorized 75,000,000 shares; issued, 2012, 62,311,787; 2011, 61,803,462 62 62  
Additional paid-in capital 383,135 373,384  
Retained earnings 921,969 840,644 789,128
Accumulated other comprehensive income (loss), net of taxes:      
Net unrealized gains and losses on fixed maturities and equity securities 382,400 268,222 111,268
Net funded status of pension and other postretirement benefit obligations (15,311) (16,242)  
Treasury stock, at cost, 2012, 22,943,925 shares; 2011, 22,028,030 shares (426,452) (410,717)  
Total shareholders' equity 1,245,803 1,055,353 847,087
Total liabilities and shareholders' equity 8,167,726 7,435,169  
Parent Company [Member]
      
ASSETS      
Investments and cash 29,554 18,772  
Investment in subsidiaries 1,406,641 1,232,987  
Other assets 52,223 48,696  
Total assets 1,488,418 1,300,455  
LIABILITIES AND SHAREHOLDERS' EQUITY      
Short-term debt 38,000 38,000  
Long-term debt 199,809 199,744  
Other liabilities 4,806 7,358  
Total liabilities 242,615 245,102  
Preferred stock, $0.001 par value, authorized 1,000,000 shares; none issued        
Common stock, $0.001 par value, authorized 75,000,000 shares; issued, 2012, 62,311,787; 2011, 61,803,462 62 62  
Additional paid-in capital 383,135 373,384  
Retained earnings 921,969 840,644  
Accumulated other comprehensive income (loss), net of taxes:      
Net unrealized gains and losses on fixed maturities and equity securities 382,400 268,222  
Net funded status of pension and other postretirement benefit obligations (15,311) (16,242)  
Treasury stock, at cost, 2012, 22,943,925 shares; 2011, 22,028,030 shares (426,452) (410,717)  
Total shareholders' equity 1,245,803 1,055,353  
Total liabilities and shareholders' equity $ 1,488,418 $ 1,300,455