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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, 2017 $ 523 $ (100,694) $ 232,670 $ (724) $ 854,176 $ 985,951
Beginning Balance, Shares at Dec. 31, 2017 52,277 4,152        
Comprehensive income       198 73,681 73,879
Common stock purchased for treasury   $ (508)       (508)
Common stock purchased for treasury, shares   5        
Restricted shares forfeited, Shares   3        
Share-based compensation $ 2 $ (11,524) 3,467     (8,055)
Share-based compensation, Shares 160 119        
Exercise of stock options     919     919
Exercise of stock options, Shares 59          
Ending Balance at Mar. 31, 2018 $ 525 $ (112,726) 237,056 (526) 926,683 1,051,012
Ending Balance, Shares at Mar. 31, 2018 52,496 4,279        
Cumulative effect from the adoption of accounting pronouncements, net of taxes         (1,174) (1,174)
Beginning Balance at Dec. 31, 2018 $ 527 $ (125,452) 256,806 (453) 1,082,169 1,213,597
Beginning Balance, Shares at Dec. 31, 2018 52,690 4,489        
Comprehensive income       (107) 73,243 73,136
Common stock purchased for treasury   $ (10,000)       (10,000)
Common stock purchased for treasury, shares   108        
Restricted shares forfeited, Shares   11        
Share-based compensation $ 1 $ (8,127) 2,635     (5,491)
Share-based compensation, Shares 149 68        
Exercise of stock options $ 1   1,630     1,631
Exercise of stock options, Shares 83          
Ending Balance at Mar. 31, 2019 $ 529 $ (143,579) $ 261,071 $ (560) $ 1,155,412 $ 1,272,873
Ending Balance, Shares at Mar. 31, 2019 52,922 4,676