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RESTRUCTURING COSTS - Schedule of Restructuring liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended 39 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Restructuring Reserve [Roll Forward]      
Beginning balance $ 10,641    
Cost incurred and charged to expense 1,038 $ 656 $ 23,481
Cost paid or otherwise settled (512)    
Ending balance $ 11,167   $ 11,167