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BASIS OF PRESENTATION (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2018 | Dec. 31, 2015
Disclosure of subsidiaries [line items] |  |  |  |  |
Net sales | $ 11,454,807 | $ 9,700,296 | $ 7,223,975 |  |
Assets | 12,547,862 | 12,122,566 |  |  |
Liabilities | 5,063,286 | 6,269,795 |  |  |
Equity | 7,484,576 | 5,852,771 | $ 5,166,593 | $ 6,543,604 | $ 4,802,997
Ternium Argentina S.A. |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Net sales | 1,959,000 | 2,301,000 |  |  |
Profit (loss) from continuing operations attributable to non-controlling interests | 254,000 | 337,000 |  |  |
Assets | 3,184,000 | 2,820,000 |  |  |
Liabilities | 606,000 | 874,000 |  |  |
Equity | $ 2,578,000 | $ 1,945,000 |  |  |

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