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Inventories, Net - Schedule of Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials $ 39,499 $ 40,219
Work in process 9,137 5,606
Finished goods 6,773 4,124
Stores and spares 5,525 5,016
Packing material 340 284
Total Inventories 61,274 55,249
Less: inventory allowances (146) (157)
Total inventories, net $ 61,128 $ 55,092