PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Total	$ 472,145		$ 471,804
Accumulated depreciation	(311,956)		(310,445)
Property, plant and equipment, net	160,189		161,359
Assets under finance leases	6,700		6,700
Accumulated amortization for assets under finance leases	1,700		1,600
Depreciation expense	6,500	$ 7,500
Land
Property, Plant and Equipment [Line Items]
Total	5,208		5,743
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Total	57,902		58,972
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total	304,018		306,366
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total	11,555		11,642
Capitalized ERP system development costs
Property, Plant and Equipment [Line Items]
Total	45,917		45,917
Computers and computer software
Property, Plant and Equipment [Line Items]
Total	22,281		22,243
Automobiles
Property, Plant and Equipment [Line Items]
Total	4,326		4,356
Construction in progress
Property, Plant and Equipment [Line Items]
Total	$ 20,938		$ 16,565