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Consolidated Statements Of Stockholders' Equity (USD $)
In Thousands, unless otherwise specified
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Other Comprehensive Income, net of taxes [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Balance at Dec. 31, 2013 $ 285,143 $ 719 $ 168,329 $ 49 $ 127,464 $ (11,418)
Balance (in shares) at Dec. 31, 2013   71,868        
Comprehensive income:            
Net income for the period 6,378       6,378  
Unrealized gain on available for sale marketable securities, net of taxes 3 [1]     3    
Total comprehensive income (loss) 6,381          
Exercise of stock options, net of shares tendered for payment 4,522 3 4,519       
Exercise of stock options and other stock-based compensation, net of shares tendered for payment (in shares)   316        
Tax benefit from equity compensation plans 1,042   1,042      
Share-based compensation expense — stock options and restricted stock 2,027   2,027      
Treasury shares issued for Deferred Compensation Plan funding and redemptions 520   503     17
Shares issued pursuant to Employee Stock Purchase Plan 1,851   1,457     394
Cash dividends (36,598)       (36,598)  
Shares issued pursuant to Dividend Reinvestment Plan 55   223     (168)
Adjustment to purchase price allocation 3,934   3,934      
Shares issued pursuant to prior year acquisition (in shares)   300        
Shares issued pursuant to prior year acquisition 0 3 (3)      
Balance at Sep. 30, 2014 $ 268,877 $ 725 $ 182,031 $ 52 $ 97,244 $ (11,175)
Balance (in shares) at Sep. 30, 2014   72,484        
[1] All amounts are net of tax.