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STOCK-BASED COMPENSATION - SCHEDULE OF EXPENSES (Details) - LTIP - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
STOCK-BASED COMPENSATION        
Total stock-based compensation $ 2,195 $ 1,474 $ 3,807 $ 2,713
Restricted stock units        
STOCK-BASED COMPENSATION        
Total stock-based compensation 1,746 1,284 3,067 2,585
Performance stock units        
STOCK-BASED COMPENSATION        
Total stock-based compensation 449 195 $ 740 2
Stock options        
STOCK-BASED COMPENSATION        
Total stock-based compensation $ 0 $ (5)   $ 126