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STOCK-BASED COMPENSATION - Stock option activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Aggregate Intrinsic Value        
Proceeds from stock option exercises and ESPP purchases $ 2,069 $ 618 $ 5,738  
Options [Member]        
Option Shares        
Outstanding at the beginning of the period (in shares) 936 757 759  
Granted (in shares) 168 231 160  
Exercised (in shares) (42) (8) (130)  
Forfeited (in shares) (19) (44) (31)  
Expired (in shares) (55)   (1)  
Outstanding at the end of the period (in shares) 988 936 757 759
Exercisable at the end of the period (in shares) 613      
Weighted Average Exercise Price        
Outstanding at the beginning of the period (in dollars per share) $ 48.44 $ 54.21 $ 49.74  
Granted (in dollars per share) 33.09 30.29 65.97  
Exercised (in dollars per share) 40.25 36.81 41.99  
Forfeited (in dollars per share) 59.84 54.54 56.66  
Expired (in dollars per share) 55.59   54.36  
Outstanding at the end of the period (in dollars per share) 45.56 48.44 54.21 $ 49.74
Exercisable at the end of the period (in dollars per share) 51.60      
Weighted Average Grant-date Fair Value        
Granted (in dollars per share) $ 15.71 $ 14.39 $ 40.14  
Weighted Average Remaining Term (years)        
Outstanding at the end of the period weighted average remaining term 6 years 7 months 6 days 7 years 1 month 6 days 7 years 2 months 12 days 7 years 7 months 6 days
Exercisable at the end of the period weighted average remaining term 5 years 3 months 18 days      
Aggregate Intrinsic Value        
Outstanding at the beginning of the period intrinsic value (in dollars) $ 372 $ 6,761 $ 2,221  
Exercised at the end of the period intrinsic value (in dollars) 552 216 3,335  
Outstanding at the end of the period intrinsic value (in dollars) 6,786 372 6,761 $ 2,221
Exercisable at the end of the period intrinsic value (in dollars) 1,994      
Unrecognized option costs $ 5,300      
Period of cost recognition 2 years 7 months 6 days      
Stock options exercise tax benefit $ 100 43 700  
Proceeds from stock option exercises and ESPP purchases $ 1,700 $ 300 $ 5,500