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STOCK-BASED COMPENSATION - UNRECOGNIZED COMPENSATION EXPENSE (Details)
$ in Thousands
Jun. 30, 2021
USD ($)
STOCK-BASED COMPENSATION  
Unrecognized Compensation Expense $ 16,050
Restricted stock units  
STOCK-BASED COMPENSATION  
Unrecognized Compensation Expense 10,411
Performance stock units  
STOCK-BASED COMPENSATION  
Unrecognized Compensation Expense $ 5,639