RESTRUCTURING COSTS AND ACCRUALS (Details) - Employee Severance [Member] $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)
Restructuring accrual [Roll Forward]
Accrual balance at beginning of year	$ 3,687
New restructuring charges - operating expenses	912
Cash payments	(2,438)
Foreign exchange impact on ending balance	(36)
Accrual balance at end of period	2,125
2016 Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Accrual Adjustment	$ 1,100	$ 100
Restructuring and Related Cost, Number of Positions Eliminated	23