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RESTRUCTURING COSTS - Schedule of Restructuring liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 42 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Restructuring Reserve [Roll Forward]          
Beginning balance     $ 10,641    
Cost incurred and charged to expense $ 211 $ 5,790 1,249 $ 6,446 $ 23,692
Cost paid or otherwise settled     (2,503)    
Effect of change in exchange rates     (1)    
Ending balance $ 9,386   $ 9,386   $ 9,386