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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common stock [Member]
Additional paid-in capital [Member]
Treasury stock [Member]
Accumulated other comprehensive income (loss) [Member]
Retained earnings [Member]
Balance (in shares) at Dec. 31, 2019   60,206,091        
Balance at Dec. 31, 2019 $ 396,764 $ 60 $ 457,804 $ (290,665) $ (5,290) $ 234,855
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 4,639         4,639
Exercise of stock options and vesting of restricted stock units (in shares)   210,057        
Exercise of stock options and vesting of restricted stock units $ 1   1      
Employee taxes paid for withheld shares upon equity award settlement (in shares) 245,358          
Employee taxes paid for withheld shares upon equity award settlement $ (19,782)     (19,782)    
Stock-based compensation 13,580   13,539     41
Restricted stock grants (in shares)   563,947        
Restricted stock grants 1 $ 1        
Restricted stock cancellations (in shares)   (47,456)        
Other comprehensive income $ (8,850)       (8,850)  
Dividends per share (in dollars per share) $ 0.12          
Payment of dividends $ (5,960)         (5,960)
Balance (in shares) at Mar. 31, 2020   60,932,639        
Balance at Mar. 31, 2020 380,393 $ 61 471,344 (310,447) (14,140) 233,575
Balance (in shares) at Dec. 31, 2019   60,206,091        
Balance at Dec. 31, 2019 396,764 $ 60 457,804 (290,665) (5,290) 234,855
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 16,462          
Balance (in shares) at Jun. 30, 2020   60,901,100        
Balance at Jun. 30, 2020 410,802 $ 61 491,450 (311,661) (14,476) 245,428
Balance (in shares) at Mar. 31, 2020   60,932,639        
Balance at Mar. 31, 2020 380,393 $ 61 471,344 (310,447) (14,140) 233,575
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 11,823         11,823
Exercise of stock options and vesting of restricted stock units (in shares)   7,111        
Exercise of stock options and vesting of restricted stock units $ 3   3      
Employee taxes paid for withheld shares upon equity award settlement (in shares) 21,200          
Employee taxes paid for withheld shares upon equity award settlement $ (1,214)     (1,214)    
Stock-based compensation 20,133   20,103     30
Restricted stock grants (in shares)   20,776        
Restricted stock grants 0 $ 0        
Restricted stock cancellations (in shares)   (59,426)        
Other comprehensive income (336)       (336)  
Balance (in shares) at Jun. 30, 2020   60,901,100        
Balance at Jun. 30, 2020 410,802 $ 61 491,450 (311,661) (14,476) 245,428
Balance (in shares) at Dec. 31, 2020   60,904,638        
Balance at Dec. 31, 2020 426,150 $ 61 544,963 (353,091) (2,497) 236,714
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income $ (164)         (164)
Purchase of treasury shares under stock repurchase program (in shares) 465,821          
Purchase of treasury shares under stock repurchase program, cost method $ (28,066)     (28,066)    
Exercise of stock options and vesting of restricted stock units (in shares)   206,418        
Exercise of stock options and vesting of restricted stock units $ 0   0      
Employee taxes paid for withheld shares upon equity award settlement (in shares) 240,867          
Employee taxes paid for withheld shares upon equity award settlement $ (18,426)     (18,426)    
Stock-based compensation 30,005   29,995     10
Restricted stock grants (in shares)   519,009        
Restricted stock grants 1 $ 1        
Restricted stock cancellations (in shares)   (34,789)        
Other comprehensive income 6,660       6,660  
Balance (in shares) at Mar. 31, 2021   61,595,276        
Balance at Mar. 31, 2021 416,160 $ 62 574,958 (399,583) 4,163 236,560
Balance (in shares) at Dec. 31, 2020   60,904,638        
Balance at Dec. 31, 2020 426,150 $ 61 544,963 (353,091) (2,497) 236,714
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income $ 6,567          
Purchase of treasury shares under stock repurchase program (in shares) 870,868          
Purchase of treasury shares under stock repurchase program, cost method $ (58,100)          
Balance (in shares) at Jun. 30, 2021   62,332,714        
Balance at Jun. 30, 2021 405,274 $ 62 605,486 (449,877) 6,291 243,312
Balance (in shares) at Mar. 31, 2021   61,595,276        
Balance at Mar. 31, 2021 416,160 $ 62 574,958 (399,583) 4,163 236,560
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income $ 6,731         6,731
Purchase of treasury shares under stock repurchase program (in shares) 405,047          
Purchase of treasury shares under stock repurchase program, cost method $ (30,008)     (30,008)    
Exercise of stock options and vesting of restricted stock units (in shares)   804,323        
Exercise of stock options and vesting of restricted stock units $ 0   0      
Employee taxes paid for withheld shares upon equity award settlement (in shares) 285,521          
Employee taxes paid for withheld shares upon equity award settlement $ (20,286)     (20,286)    
Stock-based compensation 30,549   30,528     21
Restricted stock grants (in shares)   9,431        
Restricted stock grants 0 $ 0        
Restricted stock cancellations (in shares)   (76,316)        
Other comprehensive income 2,128       2,128  
Balance (in shares) at Jun. 30, 2021   62,332,714        
Balance at Jun. 30, 2021 $ 405,274 $ 62 $ 605,486 $ (449,877) $ 6,291 $ 243,312