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PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Property, plant and equipment [Abstract]    
Property, plant and equipment, gross $ 289,020 $ 285,687
Less: accumulated depreciation 104,253 95,894
Property, plant and equipment, net 184,767 189,793
Land [Member]    
Property, plant and equipment [Abstract]    
Property, plant and equipment, gross 6,173 7,262
Building [Member]    
Property, plant and equipment [Abstract]    
Property, plant and equipment, gross 64,112 63,224
Equipment [Member]    
Property, plant and equipment [Abstract]    
Property, plant and equipment, gross 205,889 201,341
Construction in Progress [Member]    
Property, plant and equipment [Abstract]    
Property, plant and equipment, gross $ 12,846 $ 13,860