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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Common Stock
Additional Paid In Capital 
Retained Earnings
Retained Earnings
Cumulative Effect, Period of Adoption, Adjustment
Treasury Stock
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss)
Cumulative Effect, Period of Adoption, Adjustment
BALANCE, Shares at Dec. 31, 2017     32,524,934            
BALANCE at Dec. 31, 2017 $ 210,528 $ 2,142 $ 325 $ 174,043 $ 48,434 $ 2,030   $ 507 $ 112
BALANCE, Treasury Stock, Shares at Dec. 31, 2017             (662,788)    
BALANCE, Treasury Stock, Value at Dec. 31, 2017             $ (12,781)    
Net income 54,748       54,748        
Issuance of common stock awards to employees (in shares)     194,093            
Issuance of common stock awards to employees 0   $ 2 (2)          
Surrender of common stock awards by employees (in shares)             (43,871)    
Surrender of common stock awards (2,282)           $ (2,282)    
Share-based compensation expense 7,598     7,598          
Share-based compensation issued to directors (in shares)     4,945            
Share-based compensation issued to directors 176     176          
Common stock repurchase (in shares)             (2,101,702)    
Common stock repurchase (89,362)           $ (89,362)    
Net change in cash flow hedges, net of tax (1,050)             (1,050)  
BALANCE at Dec. 31, 2018 182,498   $ 327 181,815 105,212     (431)  
BALANCE, Shares at Dec. 31, 2018     32,723,972            
BALANCE, Treasury Stock, Value at Dec. 31, 2018             $ (104,425)    
BALANCE, Treasury Stock, Shares at Dec. 31, 2018             (2,808,361)    
Net income 68,159       68,159        
Issuance of common stock awards to employees (in shares)     139,862            
Issuance of common stock awards to employees 0   $ 2 (2)          
Surrender of common stock awards by employees (in shares)             (46,803)    
Surrender of common stock awards (2,331)           $ (2,331)    
Share-based compensation expense 8,057     8,057          
Share-based compensation issued to directors (in shares)     7,670            
Share-based compensation issued to directors 360     360          
Net change in cash flow hedges, net of tax (6,712)             (6,712)  
BALANCE at Dec. 31, 2019 $ 250,031 $ (1,190) $ 329 190,230 173,371 $ (1,190)   (7,143)  
BALANCE, Shares at Dec. 31, 2019 32,871,504   32,871,504            
BALANCE, Treasury Stock, Value at Dec. 31, 2019 $ (106,756)           $ (106,756)    
BALANCE, Treasury Stock, Shares at Dec. 31, 2019 (2,855,164)           (2,855,164)    
Net income $ 97,239       97,239        
Issuance of common stock awards to employees (in shares)     264,004            
Issuance of common stock awards to employees 0   $ 2 (2)          
Surrender of common stock awards by employees (in shares)             (30,223)    
Surrender of common stock awards (973)           $ (973)    
Share-based compensation expense 9,286     9,286          
Share-based compensation issued to directors (in shares)     6,371            
Share-based compensation issued to directors 333     333          
Common stock repurchase (in shares)             (633,220)    
Common stock repurchase (33,924)           $ (33,924)    
Net change in cash flow hedges, net of tax (1,620)             (1,620)  
BALANCE at Dec. 31, 2020 $ 319,182   $ 331 $ 199,847 $ 269,420     $ (8,763)  
BALANCE, Shares at Dec. 31, 2020 33,141,879   33,141,879            
BALANCE, Treasury Stock, Value at Dec. 31, 2020 $ (141,653)           $ (141,653)    
BALANCE, Treasury Stock, Shares at Dec. 31, 2020 (3,518,607)           (3,518,607)