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Consolidated Statements of Stockholders' Equity (USD $)
Total
Common Stock
Additional Paid-in Capital
Total Retained Earnings
Accumulated Other Comprehensive Income
Treasury Stock
Beginning Balance at Dec. 31, 2011 $ 217,726,000 $ 695,000 $ 105,727,000 $ 126,921,000 $ 343,000 $ (15,960,000)
Beginning Balance (in shares) at Dec. 31, 2011   69,473,000        
Net income 19,899,000     19,899,000    
Unrealized loss on available for sale marketable securities, net of $99,000 of taxes (190,000)       (190,000)  
Comprehensive income 19,709,000          
Exercise of stock options and other share- based compensation, net of 13,000 shares tendered for payment (in shares)   274,000        
Exercise of stock options and other share- based compensation, net of 13,000 shares tendered for payment 2,664,000 2,000 2,355,000     307,000
Tax benefit arising from stock option transactions 1,051,000   1,051,000      
Share-based compensation expense - stock options 949,000   949,000      
Treasury shares issued for Deferred Compensation Plan funding and redemptions (10,000 shares) 452,000   394,000     58,000
Shares issued pursuant to Employee Stock Plans (in shares) 70,000 70,000        
Shares issued pursuant to Employee Stock Plans 1,250,000 1,000 1,278,000     (29,000)
Cash dividends - $.32 per common share (21,803,000)     (21,803,000)    
Shares issued pursuant to Dividend Reinvestment Plan (1,000 shares) 59,000   41,000     18,000
Ending Balance at Jun. 30, 2012 $ 222,057,000 $ 698,000 $ 111,795,000 $ 125,017,000 $ 153,000 $ (15,606,000)
Ending Balance (in shares) at Jun. 30, 2012   69,817,000