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INVENTORIES, NET
 12 Months Ended
Dec. 31, 2017
Subclassifications of assets, liabilities and equities [abstract]  
INVENTORIES, NET
 
As of December 31,
 
2017
 
2016
 
 
 
 
Raw materials, materials and spare parts
616,870

 
401,481

Goods in process
1,251,779

 
811,378

Finished goods
423,372

 
281,770

Goods in transit
295,106

 
186,673

Obsolescence allowance (Note 19)
(36,197
)
 
(33,433
)
 
 
 
 
Inventories, net
2,550,930

 
1,647,869