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PROPERTY, PLANT AND EQUIPMENT - Schedule of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Abstract]    
Land $ 35,485 $ 34,493
Buildings and building improvements 141,098 139,636
Machinery and equipment 266,803 254,544
Construction in progress 31,772 17,672
Property, plant and equipment, gross 475,158 446,345
Less: accumulated depreciation (268,167) (250,982)
Property, plant, and equipment, net $ 206,991 $ 195,363