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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Earnings [Member]
Total
Beginning Balance at Dec. 31, 2015 $ 503 $ (69,332) $ 177,167 $ (489) $ 502,402 $ 610,251
Beginning Balance, Shares at Dec. 31, 2015 50,288 3,411        
Comprehensive income       (421) 148,514 148,093
Common stock purchased for treasury   $ (15,367)       (15,367)
Common stock acquired, shares   416        
Restricted shares forfeited, Shares   9        
Share-based compensation $ 3 $ (4,695) 12,273     7,581
Share-based compensation, Shares 275 114        
Exercise of stock options $ 9   13,198     13,207
Exercise of stock options, Shares 946          
Excess tax benefits     9,921     9,921
Ending Balance at Dec. 31, 2016 $ 515 $ (89,394) 212,559 (910) 650,916 773,686
Ending Balance, Shares at Dec. 31, 2016 51,509 3,950        
Comprehensive income       186 203,319 203,505
Common stock purchased for treasury   $ (1,510)       (1,510)
Common stock acquired, shares   17        
Restricted shares forfeited, Shares   34        
Share-based compensation $ 2 $ (9,790) 12,686     2,898
Share-based compensation, Shares 192 151        
Exercise of stock options $ 6   7,366     7,372
Exercise of stock options, Shares 576          
Ending Balance at Dec. 31, 2017 $ 523 $ (100,694) 232,670 (724) 854,176 985,951
Ending Balance, Shares at Dec. 31, 2017 52,277 4,152        
Cumulative effect from the adoption of accounting pronouncements, net of taxes     59   (59)  
Comprehensive income       427 229,011 229,438
Adoption impact - ASU 2018-02 | Accounting Standards Update 2018-02 [Member]       (156) 156  
Common stock purchased for treasury   $ (9,606)       $ (9,606)
Common stock acquired, shares   91       91
Restricted shares forfeited, Shares   95        
Share-based compensation $ 2 $ (15,152) 19,506     $ 4,356
Share-based compensation, Shares 163 151        
Exercise of stock options $ 2   4,630     4,632
Exercise of stock options, Shares 250          
Ending Balance at Dec. 31, 2018 $ 527 $ (125,452) $ 256,806 $ (453) 1,082,169 1,213,597
Ending Balance, Shares at Dec. 31, 2018 52,690 4,489        
Cumulative effect from the adoption of accounting pronouncements, net of taxes         $ (1,174) $ (1,174)