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COST OF SALES (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Analysis of income and expense [abstract]      
Inventories at the beginning of the year $ 2,158,298 $ 2,689,829 $ 2,550,930
Effect of initial inflation adjustment (Note 3 (cc)) 0 0 191,708
Translation differences 0 (21,919) (413,436)
Raw materials and consumables used and other movements 5,359,938 6,165,654 6,961,704
Services and fees 112,924 151,373 158,551
Labor cost 546,045 611,615 699,447
Depreciation of property, plant and equipment 527,283 508,934 456,522
Amortization of intangible assets 14,624 17,805 25,374
Maintenance expenses 371,368 467,090 519,625
Office expenses 6,131 8,513 8,586
Insurance 10,641 9,674 8,769
Change of obsolescence allowance (1,279) 8,413 17,322
Recovery from sales of scrap and by-products (20,892) (23,793) (27,744)
Others 16,623 17,550 15,799
Less: Inventories at the end of the year (2,001,781) (2,158,298) (2,689,829)
Cost of Sales $ 7,099,923 $ 8,452,440 $ 8,483,328