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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)    
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 92,723          
Other comprehensive income (loss) 25,415          
Ending balance, common stock, shares issued at Sep. 30, 2018   44,076        
Ending balance, treasury stock, shares at Sep. 30, 2018     5,167      
Ending balance, net of taxes at Sep. 30, 2018 747,762 $ 441 $ (133,979) 526,716 (51,287) 405,871
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 income (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
Net income 13,848         13,848
Other comprehensive income (loss) 5,620       5,620  
Common stock issued, shares   18        
Common stock issued, value 0 $ 0        
Stock-based compensation 2,162     2,162    
Common stock dividends (42,511)         (42,511)
Tax withholding payments on stock-based awards (15)     (15)    
Proceeds from exercise of stock options 470     470    
Ending balance, common stock, shares issued at Sep. 30, 2018   44,076        
Ending balance, treasury stock, shares at Sep. 30, 2018     5,167      
Ending balance, net of taxes at Sep. 30, 2018 $ 747,762 $ 441 $ (133,979) 526,716 (51,287) 405,871
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        
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 $ 66,278          
Other comprehensive income (loss) $ 904          
Ending balance, common stock, shares issued at Sep. 30, 2019 44,343 44,343        
Ending balance, treasury stock, shares at Sep. 30, 2019 5,367   5,367      
Ending balance, net of taxes at Sep. 30, 2019 $ 731,566 $ 443 $ (138,909) 531,119 (46,748) 385,661
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 income (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        
Ending balance, treasury stock, shares at Jun. 30, 2019     5,367      
Ending balance, net of taxes at Jun. 30, 2019 705,021 $ 443 $ (138,909) 529,147 (47,717) 362,057
Net income 27,171         27,171
Other comprehensive income (loss) 969       969  
Common stock issued, shares   1        
Common stock issued, value 0 $ 0        
Stock-based compensation 1,947     1,947    
Common stock dividends (3,567)         (3,567)
Tax withholding payments on stock-based awards $ (1)     (1)    
Proceeds from exercise of stock options       27    
Other       (1)    
Ending balance, common stock, shares issued at Sep. 30, 2019 44,343 44,343        
Ending balance, treasury stock, shares at Sep. 30, 2019 5,367   5,367      
Ending balance, net of taxes at Sep. 30, 2019 $ 731,566 $ 443 $ (138,909) $ 531,119 $ (46,748) $ 385,661