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Inventories, Net - Schedule of Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 44,009 $ 43,744
Work in process 24,390 25,957
Finished goods 5,405 14,251
Stores and spares 7,557 7,437
Packing material 860 540
Total Inventories 82,221 91,929
Less: Inventory allowance (81) (80)
Total inventories, net $ 82,140 $ 91,849