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INVESTMENTS IN NON-CONSOLIDATED COMPANIES INVESTMENTS IN NON-CONSOLIDATED COMPANIES (Schedule of principal in non-consolidated companies) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of unconsolidated structured entities [line items] |  |  |
Investments in non-consolidated companies | $ 478,348 | $ 418,379 | $ 250,412
USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |
Proportion of voting rights held by non-consolidated companies | 20.47% |  |
Investments in non-consolidated companies | $ 466,299 | 411,134 | $ 239,960
Other non-consolidated companies |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |
Investments in non-consolidated companies | $ 5,187 | $ 3,801 |
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 | $ 466,299 | $ 411,134 |
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 | $ 6,862 | $ 3,444 |

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