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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, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of unconsolidated structured entities [line items]
Investments in non-consolidated companies	$ 495,241	$ 478,348	$ 418,379
USINAS SIDEÚRGICAS DE MINAS GERAIS S.A.
Disclosure of unconsolidated structured entities [line items]
Proportion of voting rights held by non-consolidated companies	20.43%
Investments in non-consolidated companies	$ 480,084	466,299	$ 411,134
Other
Disclosure of unconsolidated structured entities [line items]
Investments in non-consolidated companies	$ 4,866	$ 5,187
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	$ 480,084	$ 466,299
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	$ 10,291	$ 6,862

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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]]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 8
-IssueDate 2017-01-01
-Paragraph 24
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2017-03-01&anchor=para_24_a&doctype=Standard
-URIDate 2017-03-09

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2017-01-01
-Paragraph B16
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_B16&doctype=Appendix&seq=2
-URIDate 2017-03-09

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 54
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_e&doctype=Standard
-URIDate 2017-03-09

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