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Net income (loss) per common share - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Earnings per share [abstract] |  |
Basic and diluted net income (loss) | $ 316,135 | $ (12,545)

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- Definition The profit (loss) attributable to ordinary equity holders of the parent equity. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2017-01-01 -Paragraph 70 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=33&date=2017-03-01&anchor=para_70_a&doctype=Standard -URIDate 2017-03-09 + Details
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