INCOME TAXES - Significant Portions of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Inventories	$ 495	$ 1,470
Restricted stock and stock options	4,082	3,862
Lease liabilities	1,807	1,641
Currency and interest rate swap	649	2,831
Other	3,657	3,308
Total deferred tax assets	10,690	13,112
Deferred tax liabilities:
Amortization	28,133	32,872
Depreciation	25,484	27,897
Prepaid expenses	733	915
Right of use assets	1,769	1,926
Other	1,026	731
Total deferred tax liabilities	57,145	64,341
Valuation allowance	0	130
Net deferred tax liability	$ 46,455	$ 51,359