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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (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, 2011   $ 62 $ 373,384 $ 840,644 $ 251,980 $ (410,717)
Conversion of common stock units, 2013, 11,851 shares; 2012, 4,266 shares             
Conversion of restricted stock units, 2013, 119,472 shares; 2012, 48,167 shares             
Options exercised and conversion of common stock units and restricted stock units     2,436      
Share-based compensation expense     430      
Net income 26,671     26,671    
Cash dividends, 2013, $0.195 per share; 2012, $0.13 per share       (5,372)    
Change in net unrealized gains and losses on fixed maturities and equity securities 12,583       12,583  
Change in net funded status of pension and other postretirement benefit obligations              
Acquisition of shares, 2013, 89,649 shares; 2012; 200,120 shares           (3,337)
Ending balance at Mar. 31, 2012 1,088,764 62 376,250 861,943 264,563 (414,054)
Beginning balance at Dec. 31, 2012 1,245,803 62 383,135 921,969 367,089 (426,452)
Options exercised, 2013, 257,527 shares; 2012, 145,618 shares   1        
Conversion of common stock units, 2013, 11,851 shares; 2012, 4,266 shares             
Conversion of restricted stock units, 2013, 119,472 shares; 2012, 48,167 shares             
Options exercised and conversion of common stock units and restricted stock units     6,754      
Share-based compensation expense     342      
Net income 27,012     27,012    
Cash dividends, 2013, $0.195 per share; 2012, $0.13 per share       (8,052)    
Change in net unrealized gains and losses on fixed maturities and equity securities (8,334)       (8,334)  
Change in net funded status of pension and other postretirement benefit obligations              
Acquisition of shares, 2013, 89,649 shares; 2012; 200,120 shares           (1,843)
Ending balance at Mar. 31, 2013 $ 1,261,683 $ 63 $ 390,231 $ 940,929 $ 358,755 $ (428,295)