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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Loss [Member]
Retained Earnings [Member]
Common stock, shares, issued at Dec. 31, 2014   43,282,000        
Beginning Balance, net of taxes at Dec. 31, 2014 $ 492,388 $ 433 $ (100,000) $ 502,739 $ (101,498) $ 190,714
Treasury stock, shares at Dec. 31, 2014     3,864,000      
Net Income 52,182         52,182
Accumulated other comprehensive loss 8,483       8,483  
Common stock issued, shares   131,000        
Common stock issued, value 1 $ 1   0    
Treasury stock, shares acquired     723,000      
Treasury stock, acquired (23,711)   $ (23,711)      
Stock-based compensation 5,825     5,825    
Other (498)     (498)    
Common stock, shares, issued at Dec. 31, 2015   43,413,000        
Ending Balance, net of taxes at Dec. 31, 2015 534,670 $ 434 $ (123,711) 508,066 (93,015) 242,896
Treasury stock, shares at Dec. 31, 2015     4,587,000      
Net Income 38,254         38,254
Accumulated other comprehensive loss 10,003       10,003  
Common stock issued, shares   107,000        
Common stock issued, value 1 $ 1   0    
Treasury stock, shares acquired     580,000      
Treasury stock, acquired (10,268)   $ (10,268)      
Stock-based compensation 8,177     8,177    
Other $ (833)     (833)    
Common stock, shares, issued at Dec. 31, 2016 43,519,647 43,520,000        
Ending Balance, net of taxes at Dec. 31, 2016 $ 580,004 $ 435 $ (133,979) 515,410 (83,012) 281,150
Treasury stock, shares at Dec. 31, 2016 5,167,000   5,167,000      
Net Income $ 82,957         82,957
Accumulated other comprehensive loss 6,310       6,310  
Common stock issued, shares   228,000        
Common stock issued, value 2 $ 2   0    
Stock-based compensation 9,730     9,730    
Common stock dividends ($0.07 per share) (2,760)         (2,760)
Tax withholding payments on stock-based awards (2,902)     (2,902)    
Proceeds from exercise of stock options 1,144     1,144    
Other $ 64     168   (104)
Common stock, shares, issued at Dec. 31, 2017 43,747,805 43,748,000        
Ending Balance, net of taxes at Dec. 31, 2017 $ 674,549 $ 437 $ (133,979) $ 523,550 $ (76,702) $ 361,243
Treasury stock, shares at Dec. 31, 2017 5,167,000   5,167,000