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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Changes in accumulated other comprehensive income (loss) [Abstract]
Net foreign currency translation adjustment	$ 1,524		$ 2,346		$ (4,619)	$ 3,127
Unrealized gain (loss) on cash flow hedge	456		49		1,133	(3,884)
Tax	(105)		172		(270)	998
Net of tax	351		221		863	(2,886)
Net change in postretirement benefit plan (see Note 14 for further information)
Amortization of prior service cost	19		19		37	38
Amortization of gain	(7)		(13)		(12)	(26)
Prior service credit	0		0		(4)	0
Total before tax	12		6		21	12
Tax	(4)		2		(6)	1
Adjustment	0		0		0	(584)
Net of tax and adjustment	8		8		15	(571)
Other comprehensive income (loss)	1,883	$ (5,624)	2,575	$ (2,905)	(3,741)	(330)
Gain (loss) related to net investment hedge	(1,024)		(1,514)		2,173	2,905
Tax expense (benefit) on net investment hedge	$ (336)		$ (260)		$ 690	$ 914

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