RESTRUCTURING - Accrued Liability Balance by Cost Type (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)
Restructuring Reserve [Roll Forward]
Balance at beginning of period	$ 9,431
Pre-tax restructuring expenses, excluding asset write-off expenses	777
Cash paid	(821)
Accrued liability included with the sale of the German facility	(7,311)
Currency translation adjustments	(34)
Balance at end of period	$ 2,042