PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Total	$ 469,307		$ 469,307		$ 471,804
Accumulated depreciation	(312,268)		(312,268)		(310,445)
Property, plant and equipment, net	157,039		157,039		161,359
Assets under finance leases	6,200		6,200		6,700
Accumulated amortization for assets under finance leases	1,800		1,800		1,600
Depreciation expense	6,200	$ 6,800	12,800	$ 14,300
Land
Property, Plant and Equipment [Line Items]
Total	4,552		4,552		5,743
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Total	55,085		55,085		58,972
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total	300,166		300,166		306,366
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total	11,344		11,344		11,642
Capitalized ERP system development costs
Property, Plant and Equipment [Line Items]
Total	45,917		45,917		45,917
Computers and computer software
Property, Plant and Equipment [Line Items]
Total	22,454		22,454		22,243
Automobiles
Property, Plant and Equipment [Line Items]
Total	4,312		4,312		4,356
Construction in progress
Property, Plant and Equipment [Line Items]
Total	$ 25,477		$ 25,477		$ 16,565