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Inventories, net (Tables)
6 Months Ended
Jun. 30, 2015
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
Inventories are comprised of the following:
 
 
 
June 30,
 
December 31,
 
 
 
2015
 
2014
 
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
 
 
 
 
40,097
 
 
29,257
 
Less: inventory allowances
 
 
-
 
 
(292)
 
Total inventories, net
 
$
40,097
 
$
28,965