ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Balances	$ 143,056	$ 119,194
Balances	153,048	121,693
Accumulated Other Comprehensive Income (Loss)
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Balances	(3,287)	(10,531)
Unrealized gain (loss) on cash flow hedges	537	(1,112)
Amounts reclassified from AOCI	171	24
Foreign currency translation gain (loss)	(4,007)	(2,428)
Balances	(6,586)	(14,047)
Defined Benefit Plan Liability
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Balances	(1,633)	(1,628)
Balances	(1,633)	(1,628)
Cash Flow Hedges
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Balances	(1,889)	(363)
Unrealized gain (loss) on cash flow hedges	704	(1,463)
Amounts reclassified from AOCI	225	31
Balances	(960)	(1,795)
Tax effect of Cash Flow Hedges
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Balances	451	86
Unrealized loss on cash flow hedges, Tax effect	(167)	351
Amounts reclassified from AOCI, Tax effect	(54)	(7)
Balances	230	430
Foreign Currency Translation Adjustments
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Balances	(216)	(8,626)
Foreign currency translation gain (loss)	(4,007)	(2,428)
Balances	$ (4,223)	$ (11,054)

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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Amount, after reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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