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Inventories, Net - Schedule of Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 40,134 $ 40,509
Work in process 25,072 11,468
Finished goods 15,476 13,236
Stores and spares 7,456 6,134
Packing material 447 438
Total Inventories 88,585 71,785
Less: inventory allowance (133) (129)
Total inventories, net $ 88,452 $ 71,656