ACCUMULATED OTHER COMPREHENSIVE INCOME - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 828,233	$ 743,667	$ 691,618
Other comprehensive (loss)/gain	(9,166)	9,737	(1,962)
Ending balance	877,015	828,233	743,667
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	4,173	(5,564)	(3,602)
Ending balance	(4,993)	4,173	$ (5,564)
Foreign currency translation adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	7,653
Other comprehensive (loss)/gain	(11,255)
Ending balance	(3,602)	7,653
Cash flow hedge
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(3,684)
Other comprehensive (loss)/gain	2,053
Ending balance	(1,631)	(3,684)
Postretirement benefit plan
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	204
Other comprehensive (loss)/gain	36
Ending balance	$ 240	$ 204