RESTRUCTURING COSTS - Schedule of Restructuring liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		33 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020
Restructuring Reserve [Roll Forward]
Beginning balance			$ 2,172
Cost incurred and charged to expense	$ 1,494	$ 152	7,940	$ 3,620	$ 17,217
Cost paid or otherwise settled			(3,339)
Effect of change in exchange rates			18
Ending balance	$ 6,791		$ 6,791		$ 6,791