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STOCK-BASED COMPENSATION - UNRECOGNIZED COMPENSATION EXPENSE (Details)
$ in Thousands
Sep. 30, 2021
USD ($)
STOCK-BASED COMPENSATION  
Unrecognized Compensation Expense $ 13,797
Restricted stock units  
STOCK-BASED COMPENSATION  
Unrecognized Compensation Expense 8,886
Performance stock units  
STOCK-BASED COMPENSATION  
Unrecognized Compensation Expense $ 4,911