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INVESTMENTS IN NON-CONSOLIDATED COMPANIES (Value of investment in Usinas) (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, 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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The amount of dividends received.

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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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