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INVESTMENTS IN NON-CONSOLIDATED COMPANIES (Schedule of principal in non-consolidated companies) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of unconsolidated structured entities [line items] |  |  |
Investments in non-consolidated companies | $ 471,306 | $ 513,648 | $ 495,241
USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |
Proportion of voting rights held by non-consolidated companies | 20.41% |  |
Investments in non-consolidated companies | $ 422,948 | 486,643 | $ 480,084
Other non-consolidated companies |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |
Investments in non-consolidated companies | $ 5,733 | $ 5,432 |
Brazil | USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |
Proportion of voting rights held by non-consolidated companies | 34.39% | 34.39% |
Investments in non-consolidated companies | $ 422,948 | $ 486,643 |
Mexico | Techgen S.A. de C.V. |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |
Proportion of voting rights held by non-consolidated companies | 48.00% | 48.00% |
Investments in non-consolidated companies | $ 42,625 | $ 21,573 |

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- Definition The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 24 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_24_a&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B16&doctype=Appendix&subtype=B -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_e&doctype=Standard -URIDate 2020-01-01 + Details
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