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Inventories, net (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Inventory [Line Items]    
Raw materials $ 30,986 $ 22,421
Work in process 3,511 2,136
Finished goods 2,879 2,158
Stores and spares 2,562 2,371
Packing material 159 171
Inventory Gross 40,097 29,257
Less: inventory allowances 0 (292)
Total inventories, net $ 40,097 $ 28,965