ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 287,053
Ending balance	425,273
Total Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	14,169
Current period other comprehensive loss	(5,383)
Ending balance	8,786
Pension Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(386)
Current period other comprehensive loss	0
Ending balance	(386)
Foreign Currency Translation1
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	5,872
Current period other comprehensive loss	(2,271)
Ending balance	3,601
Foreign Currency Gain (Loss) on Intra-Entity Transactions2
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	8,683
Current period other comprehensive loss	(3,112)
Ending balance	$ 5,571