ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Balances	$ 157,979	$ 126,280	$ 143,056	$ 119,194
Balances	162,412	134,392	162,412	134,392
Accumulated Other Comprehensive Income (Loss)
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Balances	(5,575)	(12,444)	(3,287)	(10,531)
Unrealized gain (loss) on cash flow hedges	(26)	(100)	392	(1,660)
Amounts reclassified from AOCI	181	170	527	313
Foreign currency translation gain (loss)	(2,528)	3,433	(5,580)	2,937
Balances	(7,948)	(8,941)	(7,948)	(8,941)
Defined Benefit Plan Liability
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Balances	(1,633)	(1,628)	(1,633)	(1,628)
Balances	(1,633)	(1,628)	(1,633)	(1,628)
Cash Flow Hedges
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Balances	(886)	(2,228)	(1,889)	(363)
Unrealized gain (loss) on cash flow hedges	(34)	(133)	513	(2,184)
Amounts reclassified from AOCI	237	224	693	410
Balances	(683)	(2,137)	(683)	(2,137)
Accumulated income (loss) on derivatives
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Balances	(674)	(1,694)	(1,438)	(277)
Balances	(519)	(1,624)	(519)	(1,624)
Tax effect of Cash Flow Hedges
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Balances	212	534	451	86
Unrealized loss on cash flow hedges, Tax effect	8	33	(121)	524
Amounts reclassified from AOCI, Tax effect	(56)	(54)	(166)	(97)
Balances	164	513	164	513
Foreign Currency Translation Adjustments
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Balances	(3,268)	(9,122)	(216)	(8,626)
Foreign currency translation gain (loss)	(2,528)	3,433	(5,580)	2,937
Balances	$ (5,796)	$ (5,689)	$ (5,796)	$ (5,689)

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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