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Consolidated Statements of Changes in Shareholders' Equity (USD $)
In Thousands
Total
Common stock
Additional paid-in capital
Retained earnings
Accumulated other comprehensive income (loss), net of taxes
Treasury stock, at cost
Beginning balance at Dec. 31, 2009   $ 61 $ 358,081 $ 758,343 $ 10,723 $ (407,663)
Conversion of common stock units, 2012, 15,084 shares; 2011, 15,715 shares; 2010, 160876 shares             
Conversion of restricted stock units, 2012, 104,152 shares; 2011, 182,309 shares; 2010, 47,149 shares             
Options exercised and conversion of common stock units and restricted stock units     7,204      
Share-based compensation expense     2,163      
Cumulative effect of adoption of accounting principle, net of taxes       (35,058) 3,802  
Net income 80,131     80,131    
Cash dividends, 2012, $0.55 per share; 2011, $0.46 per share; 2010, $0.35 per share       (14,288)    
Change in net unrealized gains on fixed maturities and equity securities 85,200       85,200  
Change in net funded status of pension and other postretirement benefit obligations (1,612)       (1,612)  
Ending balance at Dec. 31, 2010 847,087 61 367,448 789,128 98,113 (407,663)
Options exercised, 2012, 389,089 shares; 2011, 136,290 shares; 2010, 263,206 shares   1        
Conversion of common stock units, 2012, 15,084 shares; 2011, 15,715 shares; 2010, 160876 shares             
Conversion of restricted stock units, 2012, 104,152 shares; 2011, 182,309 shares; 2010, 47,149 shares             
Options exercised and conversion of common stock units and restricted stock units     4,485      
Share-based compensation expense     1,451      
Net income 70,506     70,506    
Cash dividends, 2012, $0.55 per share; 2011, $0.46 per share; 2010, $0.35 per share       (18,990)    
Change in net unrealized gains on fixed maturities and equity securities 156,954       156,954  
Change in net funded status of pension and other postretirement benefit obligations (3,087)       (3,087)  
Acquisition of 915,895 shares in 2012; 214,834 shares in 2011; 0 shares in 2010           (3,054)
Ending balance at Dec. 31, 2011 1,055,353 62 373,384 840,644 251,980 (410,717)
Conversion of common stock units, 2012, 15,084 shares; 2011, 15,715 shares; 2010, 160876 shares             
Conversion of restricted stock units, 2012, 104,152 shares; 2011, 182,309 shares; 2010, 47,149 shares             
Options exercised and conversion of common stock units and restricted stock units     7,275      
Share-based compensation expense     2,476      
Net income 103,866     103,866    
Cash dividends, 2012, $0.55 per share; 2011, $0.46 per share; 2010, $0.35 per share       (22,541)    
Change in net unrealized gains on fixed maturities and equity securities 114,178       114,178  
Change in net funded status of pension and other postretirement benefit obligations 931       931  
Acquisition of 915,895 shares in 2012; 214,834 shares in 2011; 0 shares in 2010           (15,735)
Ending balance at Dec. 31, 2012 $ 1,245,803 $ 62 $ 383,135 $ 921,969 $ 367,089 $ (426,452)