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Effect of fluctuations in foreign currency exchange rates (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Conversion foreign exchange gains (losses) recognized in the result of the year. | $ (1,299) | $ 460 | $ (12,364)
Gains (losses) on exchange differences on translation, before tax | (5,446) | (2,252) | (6,499)
Equity attributable to owners of parent [member] |  |  |
Gains (losses) on exchange differences on translation, before tax | (5,450) | (5,428) | (6,334)
Non-controlling interests [member] |  |  |
Gains (losses) on exchange differences on translation, before tax | $ 4 | $ 35 | $ (165)

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- Definition The gains (losses) recognised in other comprehensive income on exchange differences on the translation of financial statements of foreign operations, before tax. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 91 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_91_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Conversion foreign exchange gains (losses) recognized in the result of the year. + References No definition available. + Details
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