INCOME TAXES - Tax Effects and Tax Cuts and Jobs Act (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Components of income before income taxes
Domestic	$ 7,707	$ 10,642	$ 8,478
Foreign	15,974	12,471	10,298
Income before income taxes	23,681	23,113	18,776
Current provision
Domestic	5,903	1,866	2,167
Foreign	4,111	3,288	3,485
Total current provision	10,014	5,154	5,652
Deferred provision
Domestic	(3,915)	649	288
Foreign	193	(6,784)	(807)
Total deferred (benefit) provision	(3,722)	(6,135)	(519)
Income tax provision (benefit)	$ 6,292	$ (981)	$ 5,133
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)	1.30%	2.20%	4.20%
Change in valuation allowance (as a percent)	(0.10%)	7.20%	0.00%
Effect of foreign tax rate differences (as a percent)	3.90%	3.90%	4.30%
Permanent items, other (as a percent)	0.20%	0.20%	(0.20%)
Section 162(m) compensation	3.10%	3.00%	2.20%
R&D Credits (as a percent)	(3.90%)	(2.80%)	(3.60%)
Effect of Tax Cuts and Jobs Act (as a percent)	0.10%	1.20%	(1.30%)
Subpart F income (as a percent)	(0.10%)	(1.00%)	1.30%
Investment tax credits (as a percent)	(0.00%)	(5.60%)	(0.00%)
Net operating loss carryforwards (as a percent)	(0.00%)	(37.20%)	(0.00%)
Unrecognized tax benefits (as a percent)	0.00%	4.90%	0.00%
Other (as a percent)	1.10%	(1.20%)	(0.60%)
Provision for income taxes (as a percent)	26.60%	(4.20%)	27.30%
Noncurrent deferred tax assets:
Employee benefit plans	$ 2,122	$ 2,085
Net operating loss and tax credit carryforwards	8,277	9,802
Accrued expenses and reserves	1,672	915
Research and development costs	4,520
Other	328	218
Total noncurrent deferred tax assets	16,919	13,020
Valuation allowance	(3,031)	(2,896)
Net noncurrent deferred tax assets:	13,888	10,124
Net noncurrent deferred tax liabilities:
Property and equipment	3,187	3,238
Goodwill and intangibles	10,944	6,484
Interest rate swap derivatives	1,678
Other	142	121
Total noncurrent deferred tax liabilities	15,951	9,843
Noncurrent deferred income tax assets	4,199	5,321
Noncurrent deferred income tax liabilities	(6,262)	(5,040)
Net deferred tax asset		$ 281
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	11,189
Domestic | Foreign Tax Credits
Net noncurrent deferred tax liabilities:
Tax Credits Carryforwards	1,003
Domestic | R&D Tax Credits
Net noncurrent deferred tax liabilities:
Tax Credits Carryforwards	95
International
Net noncurrent deferred tax liabilities:
Net Operating Losses - Unlimited Carryforward	21,133
International | R&D Tax Credits
Net noncurrent deferred tax liabilities:
Tax Credits Carryforwards	$ 374