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Consolidated Statements of Shareholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 31, 2016 $ 394,287 $ 101,821 $ 292,521 $ (55)
Balance, Shares at Dec. 31, 2016   23,948,000    
Net income 153,920   153,920  
Share-based compensation 3,198 $ 3,198    
Common stock issued under stock Plans, net of shares withheld for employee taxes, Shares   104,000    
Taxes paid related to net share settlement of stock awards (2,072) $ (2,072)    
Dividends accrued at $1.04, $1.36, $1.50 per share in 2017, 2018 and 2019 (25,036)   (25,036)  
Other comprehensive (loss) gain (113)     (113)
Balance at Dec. 31, 2017 524,184 $ 102,947 421,405 (168)
Balance, Shares at Dec. 31, 2017   24,052,000    
Net income 14,466      
Balance at Mar. 31, 2018 530,284      
Balance at Dec. 31, 2017 524,184 $ 102,947 421,405 (168)
Balance, Shares at Dec. 31, 2017   24,052,000    
Net income 79,406   79,406  
Share-based compensation 4,111 $ 4,111    
Common stock issued under stock Plans, net of shares withheld for employee taxes, Shares   130,000    
Taxes paid related to net share settlement of stock awards (3,257) $ (3,257)    
Dividends accrued at $1.04, $1.36, $1.50 per share in 2017, 2018 and 2019 (33,028)   (33,028)  
Other comprehensive (loss) gain 119     119
Balance at Dec. 31, 2018 $ 571,535 $ 103,801 467,783 (49)
Balance, Shares at Dec. 31, 2018 24,182,000 24,182,000    
Balance at Mar. 31, 2018 $ 530,284      
Net income 15,912      
Balance at Jun. 30, 2018 537,195      
Net income 24,779      
Balance at Sep. 30, 2018 554,547      
Net income 24,249      
Balance at Dec. 31, 2018 $ 571,535 $ 103,801 467,783 (49)
Balance, Shares at Dec. 31, 2018 24,182,000 24,182,000    
Net income $ 18,449      
Balance at Mar. 31, 2019 580,643      
Balance at Dec. 31, 2018 $ 571,535 $ 103,801 467,783 (49)
Balance, Shares at Dec. 31, 2018 24,182,000 24,182,000    
Net income $ 96,806   96,806  
Share-based compensation 5,892 $ 5,892    
Common stock issued under stock Plans, net of shares withheld for employee taxes, Shares   114,000    
Taxes paid related to net share settlement of stock awards (3,333) $ (3,333)    
Dividends accrued at $1.04, $1.36, $1.50 per share in 2017, 2018 and 2019 (36,843)   (36,843)  
Other comprehensive (loss) gain (21)     (21)
Balance at Dec. 31, 2019 $ 634,036 $ 106,360 527,746 (70)
Balance, Shares at Dec. 31, 2019 24,296,000 24,296,000    
Balance at Mar. 31, 2019 $ 580,643      
Net income 19,488      
Balance at Jun. 30, 2019 592,309      
Net income 32,468      
Balance at Sep. 30, 2019 616,715      
Net income 26,401      
Balance at Dec. 31, 2019 $ 634,036 $ 106,360 $ 527,746 $ (70)
Balance, Shares at Dec. 31, 2019 24,296,000 24,296,000