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RESTRUCTURING COSTS - Schedule of Restructuring liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended 36 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Restructuring Reserve [Roll Forward]        
Beginning balance $ 2,172      
Cost incurred and charged to expense 13,166 $ 5,038 $ 4,239 $ 22,443
Cost paid or otherwise settled (4,714)      
Effect of change in exchange rates 17      
Ending balance $ 10,641 $ 2,172   $ 10,641