ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Changes in accumulated other comprehensive income (loss) [Abstract]
Net foreign currency translation adjustment	$ (6,143)	$ 781
Unrealized gain (loss) on cash flow hedge	677	(3,933)
Tax	(165)	826
Net of tax	512	(3,107)
Net change in postretirement benefit plan (see Note 14 for further information)
Amortization of prior service cost	18	19
Amortization of gain	(5)	(13)
Prior service credit	(4)	0
Total before tax	9	6
Tax	(2)	(1)
Adjustment	0	(584)
Net of tax and adjustment	7	(579)
Other comprehensive loss	(5,624)	(2,905)
Tax (expense) benefit on net investment hedge	$ (1,026)	$ (1,174)