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COST OF SALES (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Analysis of income and expense [abstract]      
Inventories at the beginning of the year $ (1,647,869) $ (1,579,120) $ (2,134,034)
Acquisition of business (Note 3) 400,047 0 0
Translation differences (97,148) (82,515) (204,512)
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
Cost of Sales $ 7,403,025 $ 5,384,390 $ 6,477,272