INCOME TAXES - Tax Effects and Tax Cuts and Jobs Act (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Components of income before income taxes
Domestic	$ 18,630	$ 7,707	$ 10,642
Foreign	11,070	15,974	12,471
Income before income taxes	29,700	23,681	23,113
Current provision
Domestic	7,805	5,903	1,866
Foreign	2,834	4,111	3,288
Total current provision	10,639	10,014	5,154
Deferred provision
Domestic	(4,087)	(3,915)	649
Foreign	(949)	193	(6,784)
Total deferred (benefit) provision	(5,036)	(3,722)	(6,135)
Income tax provision (benefit)	$ 5,603	$ 6,292	$ (981)
Differences in the provision (benefit) for income taxes from the amount determined by applying the federal statutory rate
Tax provision, computed at statutory rate (as a percent)	21.00%	21.00%	21.00%
State tax, net of federal impact (as a percent)	1.70%	1.30%	2.20%
Change in valuation allowance (as a percent)	(1.50%)	(0.10%)	7.20%
Effect of foreign tax rate differences (as a percent)	1.90%	3.90%	3.90%
Section 162(m) compensation	2.40%	3.10%	3.00%
R&D Credits (as a percent)	(6.10%)	(3.90%)	(2.80%)
Effect of Tax Cuts and Jobs Act (as a percent)	0.30%	0.10%	1.20%
Subpart F income (as a percent)	0.00%	(0.10%)	(1.00%)
Investment tax credits (as a percent)	(0.00%)	(0.00%)	(5.60%)
Net operating loss carryforwards (as a percent)	(0.00%)	(0.00%)	(37.20%)
Unrecognized tax benefits (as a percent)	(0.70%)	0.00%	4.90%
Other (as a percent)	(0.10%)	1.30%	(1.00%)
Provision for income taxes (as a percent)	18.90%	26.60%	(4.20%)
Noncurrent deferred tax assets:
Employee benefit plans	$ 2,241	$ 2,122
Net operating loss and tax credit carryforwards	7,277	8,277
Accrued expenses and reserves	2,494	1,672
Research and development costs	8,363	4,520
Other	502	328
Total noncurrent deferred tax assets	20,877	16,919
Valuation allowance	(2,648)	(3,031)
Net noncurrent deferred tax assets:	18,229	13,888
Net noncurrent deferred tax liabilities:
Property and equipment	2,949	3,187
Goodwill and intangibles	10,754	10,944
Interest rate swap derivatives	1,019	1,678
Other	84	142
Total noncurrent deferred tax liabilities	14,806	15,951
Noncurrent deferred income tax assets	7,760	4,199
Noncurrent deferred income tax liabilities	(4,337)	(6,262)
Net deferred tax asset/(deferred tax liability)	3,423
Net deferred tax asset/(deferred tax liability)		(2,063)
Foreign Tax Credits
Net noncurrent deferred tax liabilities:
Tax Credits Carryforwards		$ 92
Domestic
Net noncurrent deferred tax liabilities:
Net Operating Losses	8,597
Domestic | Foreign Tax Credits
Net noncurrent deferred tax liabilities:
Tax Credits Carryforwards	1,002
Domestic | R&D Tax Credits
Net noncurrent deferred tax liabilities:
Tax Credits Carryforwards	38
International
Net noncurrent deferred tax liabilities:
Net Operating Losses - Unlimited Carryforward	20,059
International | Investment Tax Credits
Net noncurrent deferred tax liabilities:
Tax Credits Carryforwards	$ 919