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Net income per common share - Reconciliation of numerator used for calculation of diluted net income per common share (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Earnings per share [abstract] |  |
Numerator for diluted net income per common share | $ 87,767 | $ 568,982
Adjustment for the effect of TSARs: |  |
Cash-settled recovery included in net income | (5,433) | (4,314)
Equity-settled expense | (4,807) | (4,769)
Numerator for diluted net income per common share | $ 77,527 | $ 559,899

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- Definition The profit (loss) attributable to ordinary equity holders of the parent entity. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2019-01-01 -Paragraph 70 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2019-en-r&anchor=para_70_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The profit (loss) attributable to ordinary equity holders of the parent entity, adjusted for the effects of all dilutive potential ordinary shares. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2019-01-01 -Paragraph 70 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2019-en-r&anchor=para_70_a&doctype=Standard -URIDate 2019-03-27 + Details
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