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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, gross $ 506,662 $ 506,515
Less: accumulated depreciation (296,986) (285,169)
Property, plant, and equipment, net 209,676 221,346
Land    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 38,886 36,794
Buildings and building improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 149,364 146,210
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 309,063 287,332
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 9,349 $ 36,179