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CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($)
$ in Thousands
Total
Previously Reported
Revision of Prior Period, Accounting Standards Update, Adjustment
Common Stock
Common Stock
Previously Reported
Treasury Stock
Treasury Stock
Previously Reported
Additional Paid-in Capital
Additional Paid-in Capital
Previously Reported
(Accumulated Deficit) Retained Earnings
(Accumulated Deficit) Retained Earnings
Previously Reported
(Accumulated Deficit) Retained Earnings
Revision of Prior Period, Accounting Standards Update, Adjustment
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss)
Previously Reported
Balance at Dec. 31, 2018 $ 598,856 $ 589,703 $ 9,153 $ 356 $ 356 $ (6,030) $ (6,030) $ 639,381 $ 639,381 $ (32,334) $ (41,487) $ 9,153 $ (2,517) $ (2,517)
Accounting Standards Update [Extensible List]     us-gaap:AccountingStandardsUpdate201602Member                 us-gaap:AccountingStandardsUpdate201602Member    
Net income 19,198                 19,198        
Foreign currency translation (274)                       (274)  
Stock-based compensation expense 3,183             3,183            
Stock options exercised 934     1       933            
Balance at Mar. 31, 2019 621,897     357   (6,030)   643,497   (13,136)     (2,791)  
Balance at Dec. 31, 2018 598,856 $ 589,703 $ 9,153 356 $ 356 (6,030) $ (6,030) 639,381 $ 639,381 (32,334) $ (41,487) $ 9,153 (2,517) $ (2,517)
Net income 46,653                          
Foreign currency translation 140                          
Balance at Jun. 30, 2019 658,055     359   (6,030)   651,784   14,319     (2,377)  
Balance at Mar. 31, 2019 621,897     357   (6,030)   643,497   (13,136)     (2,791)  
Net income 27,455                 27,455        
Foreign currency translation 414                       414  
Stock-based compensation expense 5,385             5,385            
Stock options exercised 2,904     2       2,902            
Balance at Jun. 30, 2019 658,055     359   (6,030)   651,784   14,319     (2,377)  
Balance at Dec. 31, 2019 726,283     360   (6,030)   666,585   68,109     (2,741)  
Net income 28,954                 28,954        
Foreign currency translation (988)                       (988)  
Stock-based compensation expense 5,445             5,445            
Stock options exercised 1,343     1       1,342            
Repurchases of common stock (43,238)     (6)           (43,232)        
Balance at Mar. 31, 2020 717,799     355   (6,030)   673,372   53,831     (3,729)  
Balance at Dec. 31, 2019 726,283     360   (6,030)   666,585   68,109     (2,741)  
Net income 53,058                          
Foreign currency translation (482)                          
Balance at Jun. 30, 2020 738,069     354   (6,030)   676,621   70,347     (3,223)  
Balance at Mar. 31, 2020 717,799     355   (6,030)   673,372   53,831     (3,729)  
Net income 24,104                 24,104        
Foreign currency translation 506                       506  
Stock-based compensation expense 2,616             2,616            
Stock options exercised 633             633            
Repurchases of common stock (7,589)     (1)           (7,588)        
Balance at Jun. 30, 2020 $ 738,069     $ 354   $ (6,030)   $ 676,621   $ 70,347     $ (3,223)