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Income and other taxes - Schedule of Deferred Income Tax Liabilities and Deferred Tax Expense (Recovery) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax (liabilities)/assets | $ (92,477) | $ (54,085) | $ (74,072)
Deferred income tax expense/(recovery) | 38,392 | (20,170) |
Deferred tax charged to equity | 0 | (183) |
Operating loss carry-forwards |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax (liabilities)/assets | 29,454 | 58,042 |
Deferred income tax expense/(recovery) | 28,588 | 11,045 |
Current assets and liabilities |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax (liabilities)/assets | 5,965 | 789 |
Deferred income tax expense/(recovery) | (5,176) | (811) |
Derivatives |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax (liabilities)/assets | 0 | 1,857 |
Deferred income tax expense/(recovery) | 1,857 | 1,900 |
Mining interests |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax (liabilities)/assets | (147,955) | (131,792) |
Deferred income tax expense/(recovery) | 16,163 | (25,605) |
Mine restoration provisions |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax (liabilities)/assets | 21,897 | 19,398 |
Deferred income tax expense/(recovery) | (2,499) | (4,158) |
Other |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax (liabilities)/assets | (1,838) | (2,379) |
Deferred income tax expense/(recovery) | $ (541) | $ (2,358) |

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- Definition The amount of tax expense (income) relating to changes in deferred tax liabilities and deferred tax assets. [Refer: Deferred tax assets; Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_g_ii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_g_i&doctype=Standard -URIDate 2017-03-09 + Details
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