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RESTRUCTURING AND RELATED ACTIVITIES (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Restructuring Cost and Reserve [Line Items]        
Restructuring charge $ 5,522 $ 0 $ 5,522 $ 0
Cash payments     (856)  
Restructuring Reserve $ 4,666   4,666  
Employee Severance        
Restructuring Cost and Reserve [Line Items]        
Restructuring charge     2,792  
Contract Termination        
Restructuring Cost and Reserve [Line Items]        
Restructuring charge     2,730  
Other Restructuring        
Restructuring Cost and Reserve [Line Items]        
Restructuring charge     $ 0