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Note 11 - Investments in Non-consolidated Companies - Summary of Investments in Non-consolidated Companies (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Statement Line Items [Line Items] |  |  |  |
At the beginning of the year |  | $ 640,294 | $ 557,031 |
Translation differences | [1] | 1,848 | (9,548) | $ 3,473
Equity in earnings of non-consolidated companies |  | 193,994 | 116,140 |
Dividends and distributions received (*) | [2] | (26,581) | (22,971) |
Decrease / increase in equity reserves and others |  | (3,987) | (358) |
At the end of the year |  | $ 805,568 | $ 640,294 | $ 557,031
[1] | Tenaris recognized its share over the effects on the adoption of IAS 29, "Financial Reporting in Hyperinflationary Economies" by Ternium ($49.3 million) in other comprehensive income as a currency translation adjustment.
[2] | Related to Ternium and Usiminas of which 25.7 were collected during the year.

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- Definition The amount of investments in subsidiaries, joint ventures and associates in an entity's separate financial statements. [Refer: Associates [member]; Joint ventures [member]; Subsidiaries [member]; Investments in subsidiaries] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Represents the amount of divdends declared by nonconsolidated companies. + References No definition available. + Details
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- Definition The amount of income (loss) from equity method investments in non-consolidated companies. + References No definition available. + Details
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- Definition The amount of other comprehensive income (loss), before tax, attributable to non-consolidated companies related to exchange differences when financial statements of foreign operations are translated + References No definition available. + Details
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- Definition The entity's share of the other comprehensive income of associates and joint ventures accounted for using the equity method, including dividends declared, net of tax. + References No definition available. + Details
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- References No definition available. + Details
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