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PROPERTY, PLANT AND EQUIPMENT - Capital Leased Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Abstract]    
Buildings and equipment $ 48,936 $ 53,833
Less accumulated depreciation (12,972) (6,306)
Capital leased assets, net $ 35,964 $ 47,527