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INVENTORIES, NET (Tables)
 12 Months Ended
Dec. 31, 2018
Subclassifications of assets, liabilities and equities [abstract]  
Schedule of Inventory
 
As of December 31,
 
2018
 
2017
 
 
 
 
Raw materials, materials and spare parts
850,182

 
616,870

Goods in process
1,187,071

 
1,251,779

Finished goods
464,154

 
423,372

Goods in transit
243,876

 
295,106

Obsolescence allowance (Note 19)
(55,454
)
 
(36,197
)
 
 
 
 
Inventories, net
2,689,829

 
2,550,930