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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of unconsolidated structured entities [line items] |  |  |
Investments in non-consolidated companies, beginning balance | $ 418,379 | $ 250,412 |
Share of results | 68,115 | 14,624 |
Other comprehensive income | (4,786) | 39,077 |
Dividends | 3,360 | 183 | $ 0
Acquisition of additional shares (note 3) | 0 | 114,449 | 9,600
Investments in non-consolidated companies, ending balance | 478,348 | 418,379 | 250,412
USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |
Investments in non-consolidated companies, beginning balance | 411,134 | 239,960 |
Share of results | 63,030 | 16,832 |
Other comprehensive income | (4,570) | 39,893 |
Dividends | (3,295) | 0 |
Acquisition of additional shares (note 3) | 0 | 114,449 |
Investments in non-consolidated companies, ending balance | $ 466,299 | $ 411,134 | $ 239,960

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