PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Property, plant and equipment, gross	$ 395,390	$ 378,212
Less: accumulated depreciation	165,592	150,116
Property, plant and equipment, net	229,798	228,096
Land
Property, Plant and Equipment [Abstract]
Property, plant and equipment, gross	11,826	12,215
Building
Property, Plant and Equipment [Abstract]
Property, plant and equipment, gross	88,573	86,873
Equipment
Property, Plant and Equipment [Abstract]
Property, plant and equipment, gross	251,618	247,884
Construction in progress
Property, Plant and Equipment [Abstract]
Property, plant and equipment, gross	$ 43,373	$ 31,240

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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