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COST OF SALES (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Analysis of income and expense [abstract]      
Inventories at the beginning of the year $ 2,550,930 $ 1,647,869 $ 1,579,120
Acquisition of business (Note 3) 0 400,047 0
Effect of initial inflation adjustment 191,708 0 0
Translation differences (413,436) (97,148) (82,515)
Raw materials and consumables used and other movements 6,961,704 6,337,283 4,060,783
Services and fees 158,551 110,949 77,698
Labor cost 699,447 673,821 560,513
Depreciation of property, plant and equipment 456,522 348,415 314,649
Amortization of intangible assets 25,374 35,275 40,225
Maintenance expenses 519,625 480,496 457,734
Office expenses 8,586 7,350 7,112
Insurance 8,769 7,968 8,432
Charge of obsolescence allowance 17,322 (4,028) 4,600
Recovery from sales of scrap and by-products (27,744) (25,973) (21,010)
Others 15,799 31,631 24,918
Less: Inventories at the end of the year (2,689,829) (2,550,930) (1,647,869)
Cost of Sales $ 8,483,328 $ 7,403,025 $ 5,384,390