PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 447,796	$ 416,611
Accumulated depreciation and amortization	255,845	221,817
Property, plant and equipment, net	191,951	194,794
Assets under finance leases	5,600	5,300
Accumulated amortization for assets under finance leases	500	100
Depreciation	34,400	36,200	$ 35,700
Land
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	6,380	6,376
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	59,177	57,006
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	284,020	269,084
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	10,946	10,253
Capitalized ERP system development costs
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	46,637	46,637
Computers and computer software
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	22,906	15,826
Automobiles
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	4,642	4,879
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 13,088	$ 6,550