INCOME TAXES - Components of Deferred Tax Asset and Liability (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Accounts receivable	$ 438	$ 377
Financial Hedging Instruments	2,774	1,491
Interest Expense Carryovers	0	2,371
Inventories	1,952	1,845
Net operating loss carryforwards	13,553	8,478
Operating lease	5,797	6,001
Other accrued liabilities	4,270	5,905
Pension	5,125	4,274
Tax Credits	1,498	2,015
Total deferred tax assets	35,407	32,757
Deferred tax liabilities:
Intangible assets	17,694	21,990
Right of use assets	5,797	6,001
Property, plant and equipment	24,844	28,177
Total deferred tax liabilities	48,335	56,168
Valuation allowance	12,986	9,217
Net deferred tax liabilities	$ (25,914)	$ (32,628)