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Consolidated Statements Of Changes In Shareholders' Equity (USD $)
In Thousands
Common Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss), Net Of Taxes [Member]
Treasury Stock, At Cost [Member]
Total
Beginning balance at Dec. 31, 2009$ 61$ 358,081$ 758,343$ 10,723$ (407,663) 
Conversion of common stock units, 2011, 15,715 shares; 2010, 160,876 shares      
Conversion of restricted stock units, 2011, 170,876 shares; 2010, 46,584 shares      
Options exercised and conversion of common stock units and restricted stock units 3,889    
Share-based compensation expense 1,158    
Cumulative effect of adoption of accounting principle, net of taxes  (1,338)1,338  
Net income  65,750  65,750
Cash dividends, 2011, $0.33 per share; 2010, $0.24 per share  (9,785)   
Change in net unrealized gains and losses on fixed maturities and equity securities   193,338 193,338
Change in net funded status of pension and other postretirement benefit obligations      
Ending balance at Sep. 30, 201061363,128812,970205,399(407,663)973,895
Beginning balance at Dec. 31, 201061367,448823,57996,582(407,663)880,007
Options exercised, 2011, 136,290 shares; 2010, 51,850 shares1     
Conversion of common stock units, 2011, 15,715 shares; 2010, 160,876 shares      
Conversion of restricted stock units, 2011, 170,876 shares; 2010, 46,584 shares      
Options exercised and conversion of common stock units and restricted stock units 4,247    
Share-based compensation expense 1,229    
Net income  37,252  37,252
Cash dividends, 2011, $0.33 per share; 2010, $0.24 per share  (13,634)   
Change in net unrealized gains and losses on fixed maturities and equity securities   147,427 147,427
Change in net funded status of pension and other postretirement benefit obligations      
Acquisition of shares, 2011, 60,126 shares; 2010, 0 shares    (1,007) 
Ending balance at Sep. 30, 2011$ 62$ 372,924$ 847,197$ 244,009$ (408,670)$ 1,055,522