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Consolidated Statements Of Stockholders' Equity (USD $)
In Thousands, except Share data, 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, 2012 $ 229,570 $ 700 $ 113,495 $ 127 $ 127,042 $ (11,794)
Balance, Shares at Dec. 31, 2012   70,036,000        
Comprehensive income:            
Net income for the period 27,887       27,887  
Unrealized loss on available for sale marketable securities, net of taxes (83) [1]     (83)    
Comprehensive income 27,804          
Exercise of stock options and other stock-based compensation, net of shares tendered for payment 4,680 4 4,636     40
Exercise of stock options and other stock-based compensation, net of shares tendered for payment, Shares   371,000        
Tax benefit from equity compensation plans 1,128   1,128      
Share-based compensation expense — stock options and restricted stock 1,011   1,011      
Treasury shares issued for Deferred Compensation Plan funding and redemptions 363   352     11
Shares issued pursuant to Employee Stock Plans 1,842   1,370     472
Cash dividends (22,931)       (22,931)  
Shares issued pursuant to Dividend Reinvestment Plan 53   156     (103)
Balance at Jun. 30, 2013 $ 243,520 $ 704 $ 122,148 $ 44 $ 131,998 $ (11,374)
Balance, Shares at Jun. 30, 2013   70,407,000        
[1] All amounts are net of tax.