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SEGMENT INFORMATION (Revenue by product) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of products and services [line items] |  |  |
Net sales | $ 8,735,435 | $ 10,192,818 | $ 11,454,807
Semi-finished |  |  |
Disclosure of products and services [line items] |  |  |
Net sales | 3,632 | 51,496 | 103,099
Slabs |  |  |
Disclosure of products and services [line items] |  |  |
Net sales | 1,047,311 | 1,753,090 | 1,818,235
Hot rolled |  |  |
Disclosure of products and services [line items] |  |  |
Net sales | 2,880,055 | 3,275,941 | 3,961,144
Cold rolled |  |  |
Disclosure of products and services [line items] |  |  |
Net sales | 1,101,963 | 1,165,406 | 1,264,940
Coated |  |  |
Disclosure of products and services [line items] |  |  |
Net sales | 3,015,132 | 3,263,463 | 3,506,040
Roll-formed and tubular |  |  |
Disclosure of products and services [line items] |  |  |
Net sales | 413,337 | 380,688 | 437,514
Other products |  |  |
Disclosure of products and services [line items] |  |  |
Net sales | 274,005 | 302,734 | 363,835
Total sales |  |  |
Disclosure of products and services [line items] |  |  |
Net sales | $ 8,735,435 | $ 10,192,818 | $ 11,454,807

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