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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Earnings [Member]
Beginning Balance at Dec. 31, 2014 $ 476,232 $ 497 $ (53,770) $ 158,549 $ (35) $ 370,991
Beginning Balance, Shares at Dec. 31, 2014   49,746 3,002      
Comprehensive income 130,957       (454) 131,411
Common stock purchased for treasury (11,279)   $ (11,279)      
Common stock purchased for treasury, shares     288      
Share-based compensation 6,989 $ 3 $ (4,283) 11,269    
Share-based compensation, Shares   324 94      
Restricted shares forfeited 0 $ 0 $ 0 0 0 0
Restricted shares forfeited, Shares     27      
Exercise of stock options $ 3,489 $ 3   3,486    
Exercise of stock options, Shares 218 218        
Excess tax benefits $ 3,863     3,863    
Ending Balance at Dec. 31, 2015 610,251 $ 503 $ (69,332) 177,167 (489) 502,402
Ending Balance, Shares at Dec. 31, 2015   50,288 3,411      
Comprehensive income 148,093       (421) 148,514
Common stock purchased for treasury (15,367)   $ (15,367)      
Common stock purchased for treasury, shares     416      
Share-based compensation 7,581 $ 3 $ (4,695) 12,273    
Share-based compensation, Shares   275 114      
Restricted shares forfeited 0 $ 0 $ 0 0 0 0
Restricted shares forfeited, Shares     9      
Exercise of stock options $ 13,207 $ 9   13,198    
Exercise of stock options, Shares 946 946        
Excess tax benefits $ 9,921     9,921    
Ending Balance at Dec. 31, 2016 773,686 $ 515 $ (89,394) 212,559 (910) 650,916
Ending Balance, Shares at Dec. 31, 2016   51,509 3,950      
Comprehensive income 203,505       186 203,319
Common stock purchased for treasury $ (1,510)   $ (1,510)      
Common stock purchased for treasury, shares 17   17      
Share-based compensation $ 2,898 $ 2 $ (9,790) 12,686    
Share-based compensation, Shares   192 151      
Restricted shares forfeited 0 $ 0 $ 0 0 0 0
Restricted shares forfeited, Shares     34      
Exercise of stock options $ 7,372 $ 6   7,366    
Exercise of stock options, Shares 576 576        
Ending Balance at Dec. 31, 2017 $ 985,951 $ 523 $ (100,694) 232,670 $ (724) 854,176
Ending Balance, Shares at Dec. 31, 2017   52,277 4,152      
Cumulative effect from the adoption of accounting pronouncements, net of taxes       $ 59   $ (59)