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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 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)    
Proceeds from exercise of stock options 464     464    
Other (3)     (3)    
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, 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 78,875          
Other comprehensive loss 19,795          
Ending balance, common stock, shares issued at Jun. 30, 2018   44,058        
Ending balance, treasury stock, shares at Jun. 30, 2018     5,167      
Ending balance, net of taxes at Jun. 30, 2018 768,188 $ 441 $ (133,979) 524,099 (56,907) 434,534
Beginning balance, common stock, shares issued at Mar. 31, 2018   44,040        
Beginning balance, net of taxes at Mar. 31, 2018 707,052 $ 440 $ (133,979) 521,180 (76,089) 395,500
Beginning balance, treasury stock, shares at Mar. 31, 2018     5,167      
Net income 41,825         41,825
Other comprehensive loss 19,182       19,182  
Common stock issued, shares   18        
Common stock issued, value 1 $ 1        
Stock-based compensation 2,445     2,445    
Common stock dividends (2,791)         (2,791)
Tax withholding payments on stock-based awards (3)     (3)    
Proceeds from exercise of stock options 478     478    
Other (1)     (1)    
Ending balance, common stock, shares issued at Jun. 30, 2018   44,058        
Ending balance, treasury stock, shares at Jun. 30, 2018     5,167      
Ending balance, net of taxes at Jun. 30, 2018 $ 768,188 $ 441 $ (133,979) 524,099 (56,907) 434,534
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 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        
Ending balance, treasury stock, shares at Mar. 31, 2019     5,367      
Ending balance, net of taxes at Mar. 31, 2019 $ 679,017 $ 443 $ (138,909) 527,283 (47,684) 337,884
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 $ 39,107          
Other comprehensive loss $ (65)          
Ending balance, common stock, shares issued at Jun. 30, 2019 44,342 44,342        
Ending balance, treasury stock, shares at Jun. 30, 2019 5,367   5,367      
Ending balance, net of taxes at Jun. 30, 2019 $ 705,021 $ 443 $ (138,909) 529,147 (47,717) 362,057
Beginning balance, common stock, shares issued at Mar. 31, 2019   44,341        
Beginning balance, net of taxes at Mar. 31, 2019 679,017 $ 443 $ (138,909) 527,283 (47,684) 337,884
Beginning balance, treasury stock, shares at Mar. 31, 2019     5,367      
Net income 27,718         27,718
Other comprehensive loss (33)       (33)  
Common stock issued, shares   1        
Common stock issued, value 0 $ 0        
Stock-based compensation 1,869     1,869    
Common stock dividends (3,545)         (3,545)
Tax withholding payments on stock-based awards $ (5)     (5)    
Ending balance, common stock, shares issued at Jun. 30, 2019 44,342 44,342        
Ending balance, treasury stock, shares at Jun. 30, 2019 5,367   5,367      
Ending balance, net of taxes at Jun. 30, 2019 $ 705,021 $ 443 $ (138,909) $ 529,147 $ (47,717) $ 362,057