PROPERTY, PLANT AND EQUIPMENT - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 378,212	$ 343,341
Less: Accumulated depreciation	150,116	126,482
Property, plant and equipment, net	228,096	216,859
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment	12,215	11,588
Building
Property, Plant and Equipment [Line Items]
Property, plant and equipment	86,873	79,261
Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment	247,884	237,898
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 31,240	$ 14,594