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STOCK-BASED COMPENSATION - SCHEDULE OF EXPENSES (Details) - LTIP - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
STOCK-BASED COMPENSATION        
Total stock-based compensation $ 2,289 $ 1,723 $ 6,096 $ 4,436
Restricted stock units        
STOCK-BASED COMPENSATION        
Total stock-based compensation 1,561 1,350 4,628 3,935
Performance stock units        
STOCK-BASED COMPENSATION        
Total stock-based compensation 728 373 1,468 375
Stock options        
STOCK-BASED COMPENSATION        
Total stock-based compensation $ 0 $ 0 $ 0 $ 126