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Consolidated Statements of Stockholders' Equity (Unaudited) Statement - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Loss [Member]
Retained Earnings [Member]
Beginning balance, common stock, shares issued at Dec. 31, 2017   43,748        
Beginning balance, net of taxes at Dec. 31, 2017 $ 674,549 $ 437 $ (133,979) $ 523,550 $ (76,702) $ 361,243
Beginning balance, treasury stock, shares at Dec. 31, 2017     5,167      
Net income 37,050         37,050
Other comprehensive income (loss) 613       613  
Common stock issued, shares   292        
Common stock issued, value 3 $ 3        
Stock-based compensation 2,286     2,286    
Common stock dividends (2,793)         (2,793)
Tax withholding payments on stock-based awards (5,117)     (5,117)    
Other (3)     (3)    
Proceeds from exercise of stock options 464     464    
Ending balance, common stock, shares issued at Mar. 31, 2018   44,040        
Ending balance, treasury stock, shares at Mar. 31, 2018     5,167      
Ending balance, net of taxes at Mar. 31, 2018 $ 707,052 $ 440 $ (133,979) 521,180 (76,089) 395,500
Beginning balance, common stock, shares issued at Dec. 31, 2018 44,076 44,076        
Beginning balance, net of taxes at Dec. 31, 2018 $ 672,590 $ 441 $ (138,909) 528,654 (47,652) 330,056
Beginning balance, treasury stock, shares at Dec. 31, 2018 5,367   5,367      
Net income $ 11,389         11,389
Other comprehensive income (loss) (32)       (32)  
Common stock issued, shares   265        
Common stock issued, value 2 $ 2        
Stock-based compensation 2,200     2,200    
Common stock dividends (3,561)         (3,561)
Tax withholding payments on stock-based awards (3,569)     (3,569)    
Other $ (2)     (2)    
Ending balance, common stock, shares issued at Mar. 31, 2019 44,341 44,341        
Ending balance, treasury stock, shares at Mar. 31, 2019 5,367   5,367      
Ending balance, net of taxes at Mar. 31, 2019 $ 679,017 $ 443 $ (138,909) $ 527,283 $ (47,684) $ 337,884