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Inventories, net (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Inventory [Line Items]    
Raw materials $ 30,255 $ 22,421
Work in process 4,067 2,136
Finished goods 2,592 2,158
Stores and spares 2,585 2,371
Packing material 110 171
Total Inventories 39,609 29,257
Less: inventory allowances 0 (292)
Total inventories, net $ 39,609 $ 28,965