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COST OF SALES (Tables)
 12 Months Ended
Dec. 31, 2017
Analysis of income and expense [abstract]  
Schedule of cost of sales
 
Year ended December 31,
 
2017
 
2016
 
2015
 
 
 
 
 
 
Inventories at the beginning of the year
1,647,869

 
1,579,120

 
2,134,034

Acquisition of business (Note 3)
400,047

 
—

 
—

Translation differences
(97,148
)
 
(82,515
)
 
(204,512
)
 
 
 
 
 
 
Plus: Charges for the year
 
 
 
 
 
Raw materials and consumables used and
other movements
6,337,283

 
4,060,783

 
4,548,219

Services and fees
110,949

 
77,698

 
86,874

Labor cost
673,821

 
560,513

 
599,989

Depreciation of property, plant and equipment
348,415

 
314,649

 
335,302

Amortization of intangible assets
35,275

 
40,225

 
48,442

Maintenance expenses
480,496

 
457,734

 
507,895

Office expenses
7,350

 
7,112

 
6,683

Insurance
7,968

 
8,432

 
9,435

(Recovery) Charge of obsolescence allowance
(4,028
)
 
4,600

 
(4,816
)
Recovery from sales of scrap and by-products
(25,973
)
 
(21,010
)
 
(31,096
)
Others
31,631

 
24,918

 
19,943

 
 
 
 
 
 
Less: Inventories at the end of the year
(2,550,930
)
 
(1,647,869
)
 
(1,579,120
)
 
 
 
 
 
 
Cost of Sales
7,403,025

 
5,384,390

 
6,477,272