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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, 2018   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      
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)
Dividends declared per common share $ 0.09          
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, net of taxes at Mar. 31, 2019 679,017 $ 443 $ (138,909) 527,283 (47,684) 337,884
Ending balance, treasury stock, shares at Mar. 31, 2019     5,367      
Beginning balance, common stock, shares issued at Dec. 31, 2018   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      
Net income 66,278          
Other comprehensive income (loss) $ 904          
Dividends declared per common share $ 0.27          
Ending balance, common stock, shares issued at Sep. 30, 2019   44,343        
Ending balance, net of taxes at Sep. 30, 2019 $ 731,566 $ 443 $ (138,909) 531,119 (46,748) 385,661
Ending balance, treasury stock, shares at Sep. 30, 2019     5,367      
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)
Dividends declared per common share $ 0.09          
Tax withholding payments on stock-based awards $ (5)     (5)    
Ending balance, common stock, shares issued at Jun. 30, 2019   44,342        
Ending balance, net of taxes at Jun. 30, 2019 705,021 $ 443 $ (138,909) 529,147 (47,717) 362,057
Ending balance, treasury stock, shares at Jun. 30, 2019     5,367      
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)
Dividends declared per common share $ 0.09          
Tax withholding payments on stock-based awards $ (1)     (1)    
Proceeds from exercise of stock options 27     27    
Other (1)     (1)    
Ending balance, common stock, shares issued at Sep. 30, 2019   44,343        
Ending balance, net of taxes at Sep. 30, 2019 $ 731,566 $ 443 $ (138,909) 531,119 (46,748) 385,661
Ending balance, treasury stock, shares at Sep. 30, 2019     5,367      
Beginning balance, common stock, shares issued at Dec. 31, 2019 44,353 44,353        
Beginning balance, net of taxes at Dec. 31, 2019 $ 701,330 $ 444 $ (138,909) 533,345 (50,248) 356,698
Beginning balance, treasury stock, shares at Dec. 31, 2019 5,367   5,367      
Net income $ 12,200         12,200
Other comprehensive income (loss) 215       215  
Common stock issued, shares   211        
Common stock issued, value 2 $ 2        
Stock-based compensation 1,674     1,674    
Common stock dividends $ (3,866)         (3,866)
Dividends declared per common share $ 0.10          
Tax withholding payments on stock-based awards $ (3,309)     (3,309)    
Proceeds from exercise of stock options 27     27    
Other (2)     (2)    
Ending balance, common stock, shares issued at Mar. 31, 2020   44,564        
Ending balance, net of taxes at Mar. 31, 2020 $ 708,271 $ 446 $ (138,909) 531,735 (50,033) 365,032
Ending balance, treasury stock, shares at Mar. 31, 2020     5,367      
Beginning balance, common stock, shares issued at Dec. 31, 2019 44,353 44,353        
Beginning balance, net of taxes at Dec. 31, 2019 $ 701,330 $ 444 $ (138,909) 533,345 (50,248) 356,698
Beginning balance, treasury stock, shares at Dec. 31, 2019 5,367   5,367      
Net income $ 148,978          
Other comprehensive income (loss) $ 516          
Dividends declared per common share $ 1.90          
Ending balance, common stock, shares issued at Sep. 30, 2020 44,568 44,568        
Ending balance, net of taxes at Sep. 30, 2020 $ 778,136 $ 446 $ (138,909) 536,025 (49,732) 430,306
Ending balance, treasury stock, shares at Sep. 30, 2020 5,367   5,367      
Beginning balance, common stock, shares issued at Mar. 31, 2020   44,564        
Beginning balance, net of taxes at Mar. 31, 2020 $ 708,271 $ 446 $ (138,909) 531,735 (50,033) 365,032
Beginning balance, treasury stock, shares at Mar. 31, 2020     5,367      
Net income 33,586         33,586
Other comprehensive income (loss) 150       150  
Stock-based compensation 1,671     1,671    
Common stock dividends $ (3,970)         (3,970)
Dividends declared per common share $ 0.10          
Ending balance, common stock, shares issued at Jun. 30, 2020   44,564        
Ending balance, net of taxes at Jun. 30, 2020 $ 739,708 $ 446 $ (138,909) 533,406 (49,883) 394,648
Ending balance, treasury stock, shares at Jun. 30, 2020     5,367      
Net income 103,192         103,192
Other comprehensive income (loss) 151       151  
Common stock issued, shares   4        
Common stock issued, value 0 $ 0        
Stock-based compensation 2,494     2,494    
Common stock dividends $ (67,534)         (67,534)
Dividends declared per common share $ 1.70          
Proceeds from exercise of stock options $ 125     125    
Ending balance, common stock, shares issued at Sep. 30, 2020 44,568 44,568        
Ending balance, net of taxes at Sep. 30, 2020 $ 778,136 $ 446 $ (138,909) $ 536,025 $ (49,732) $ 430,306
Ending balance, treasury stock, shares at Sep. 30, 2020 5,367   5,367