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INVESTMENTS IN NON-CONSOLIDATED COMPANIES (Value of investment in Usinas) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of unconsolidated structured entities [line items] |  |  |
Investments in non-consolidated companies, beginning balance | $ 478,348 | $ 418,379 |
Share of results | 102,772 | 68,115 |
Other comprehensive income | (77,042) | (4,786) |
Dividends | (8,837) | (3,360) | $ (183)
Investments in non-consolidated companies, ending balance | 495,241 | 478,348 | 418,379
USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |
Investments in non-consolidated companies, beginning balance | 466,299 | 411,134 |
Share of results | 97,733 | 63,030 |
Other comprehensive income | (75,195) | (4,570) |
Dividends | (8,753) | (3,295) |
Investments in non-consolidated companies, ending balance | $ 480,084 | $ 466,299 | $ 411,134

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