ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 828,233	$ 743,667
Other comprehensive (loss) income	(5,624)	(2,905)
Ending balance	849,492	766,271
Foreign currency translation adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	7,653
Other comprehensive (loss) income	(6,143)
Ending balance	1,510
Cash flow hedge
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(3,684)
Other comprehensive (loss) income	512
Ending balance	(3,172)
Postretirement benefit plan
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	204
Other comprehensive (loss) income	7
Ending balance	211
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	4,173	(5,564)
Other comprehensive (loss) income	(5,624)	(2,905)
Ending balance	$ (1,451)	$ (8,469)