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STOCK-BASED COMPENSATION - Stock option activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Sep. 08, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Aggregate Intrinsic Value          
Proceeds from stock option exercised   $ 618 $ 5,738 $ 2,978  
Nikhil Lalwani [Member]          
Option Shares          
Granted (in shares) 179,643        
Options [Member]          
Option Shares          
Outstanding at the beginning of the period (in shares)   757,000 759,000 767,000  
Granted (in shares)   231,000 160,000 156,000  
Exercised (in shares)   (8,000) (130,000) (142,000)  
Forfeited (in shares)   (44,000) (31,000) (18,000)  
Expired (in shares)     (1,000) (4,000)  
Outstanding at the end of the period (in shares)   936,000 757,000 759,000 767,000
Exercisable at the end of the period (in shares)   571,000      
Weighted Average Exercise Price          
Outstanding at the beginning of the period (in dollars per share)   $ 54.21 $ 49.74 $ 42.93  
Granted (in dollars per share)   30.29 65.97 57.60  
Exercised (in dollars per share)   36.81 41.99 19.47  
Forfeited (in dollars per share)   54.54 56.66 60.17  
Expired (in dollars per share)     54.36 74.53  
Outstanding at the end of the period (in dollars per share)   48.44 54.21 49.74 $ 42.93
Exercisable at the end of the period (in dollars per share)   53.06      
Weighted Average Grant-date Fair Value          
Granted (in dollars per share)   $ 14.39 $ 40.14 $ 31.76  
Weighted Average Remaining Term (years)          
Outstanding at the end of the period weighted average remaining term   7 years 1 month 6 days 7 years 2 months 12 days 7 years 7 months 6 days 7 years 9 months 18 days
Exercisable at the end of the period weighted average remaining term   5 years 10 months 24 days      
Aggregate Intrinsic Value          
Outstanding at the beginning of the period intrinsic value (in dollars)   $ 6,761 $ 2,221 $ 16,785  
Exercised at the end of the period intrinsic value (in dollars)   216 3,335 5,863  
Outstanding at the end of the period intrinsic value (in dollars)   372 6,761 2,221 $ 16,785
Exercisable at the end of the period intrinsic value (in dollars)   347      
Unrecognized option costs   $ 6,000      
Period of cost recognition   2 years 7 months 6 days      
Proceeds from stock option exercised   $ 300 5,500 2,800  
Stock options exercise tax benefit   $ 43 $ 700 $ 600