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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Common Stock
Treasury Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Total
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       (329) 182,506 182,177
Common stock purchased for treasury   $ (17,293)       (17,293)
Common stock acquired, shares   175        
Restricted shares forfeited, Shares   15        
Share-based compensation $ 1 $ (8,127) 7,739     (387)
Share-based compensation, Shares 152 68        
Exercise of stock options $ 2   3,734     3,736
Exercise of stock options, Shares 208          
Ending Balance at Sep. 30, 2019 $ 530 $ (150,872) 268,279 $ (782) 1,264,675 1,381,830
Ending Balance, Shares at Sep. 30, 2019 53,050 4,747        
Beginning Balance at Dec. 31, 2019 $ 531 $ (169,365) 270,923   1,341,344 1,443,433
Beginning Balance, Shares at Dec. 31, 2019 53,054 4,949        
Comprehensive income         170,441 170,441
Common stock purchased for treasury   $ (92,315)       (92,315)
Common stock acquired, shares   1,164        
Restricted shares forfeited, Shares   11        
Share-based compensation $ 1 $ (4,969) 8,046     3,078
Share-based compensation, Shares 167 62        
Exercise of stock options     178     178
Exercise of stock options, Shares 10          
Ending Balance at Sep. 30, 2020 $ 532 $ (266,649) $ 279,147   1,507,953 1,520,983
Ending Balance, Shares at Sep. 30, 2020 53,231 6,186        
Cumulative effect from the adoption of accounting pronouncements, net of taxes         $ (3,832) $ (3,832)