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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 14,639       14,639  
Unrealized gain on available for sale marketable securities, net of taxes 1 [1]     1    
Total comprehensive income 14,640          
Exercise of stock options, net of shares tendered for payment 2,559 1 2,558       
Exercise of stock options and other stock-based compensation, net of shares tendered for payment (in shares)   181        
Tax benefit from equity compensation plans 477   477      
Share-based compensation expense — stock options and restricted stock 672   672      
Treasury shares issued for Deferred Compensation Plan funding and redemptions 526   522     4
Shares issued pursuant to Employee Stock Purchase Plan 1,851   1,457     394
Cash dividends (12,077)       (12,077)  
Shares issued pursuant to Dividend Reinvestment Plan 0   59     (59)
Balance at Mar. 31, 2014 $ 293,791 $ 720 $ 174,074 $ 50 $ 130,026 $ (11,079)
Balance (in shares) at Mar. 31, 2014   72,049        
[1] All amounts are net of tax.