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Inventories, Net - Schedule of Inventory (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Raw materials $ 45,332 $ 36,254
Work in process 6,223 3,451
Finished goods 3,188 2,875
Stores and spares 4,319 3,190
Packing material 234 241
Total Inventories $ 59,296 $ 46,011