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STOCK-BASED COMPENSATION - Valuation Assumptions (Details) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Valuation Assumptions      
Weighted-average estimated fair value of shares granted (in dollars per share) $ 6.28    
Stock options      
Valuation Assumptions      
Granted (in shares) 250 0 0
Stock options | Weighted-average      
Valuation Assumptions      
Risk-free interest rate 0.40%    
Expected term (in years) 6 years 1 month 9 days    
Volatility 46.90%    
Dividend yield 0.00%