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Inventories, Net - Schedule of Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 48,357 $ 43,744
Work in process 30,025 25,957
Finished goods 4,541 14,251
Stores and spares 7,583 7,437
Packing material 525 540
Total Inventories 91,031 91,929
Less: Inventory allowance (82) (80)
Total inventories, net $ 90,949 $ 91,849