RESTRUCTURING - Accrued Liability Balance by Cost Type (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021 USD ($)
Restructuring Reserve [Roll Forward]
Balance at beginning of period	$ 9,431
Pre-tax restructuring expenses, excluding asset write-off expenses	967
Cash paid	(1,642)
Accrued liability included with the sale of the German facility	(7,311)
Currency translation adjustments	5
Accrued liability included in Liabilities of a business held-for-sale	(1,414)
Balance at end of period	$ 36