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Income taxes - Summary of Temporary Difference (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | $ 98,218 | $ 84,043
Deferred tax liabilities | 510,935 | 513,972
Expense (recovery) on the income statement | (16,579) | (118,839)
Property, plant and equipment |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | 0 | 0
Deferred tax liabilities | 498,384 | 483,561
Expense (recovery) on the income statement | 14,823 | (108,501)
Loss carryforwards |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | 42,079 | 37,245
Deferred tax liabilities | 0 | 0
Expense (recovery) on the income statement | (4,834) | (5,788)
Liabilities |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | 31,793 | 27,321
Deferred tax liabilities | 2,545 | 0
Expense (recovery) on the income statement | (1,927) | (2,631)
Future withholding taxes |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | 0 | 0
Deferred tax liabilities | 0 | 20,000
Expense (recovery) on the income statement | (20,000) | 20,000
Other items |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | 24,346 | 19,477
Deferred tax liabilities | 10,006 | 10,411
Expense (recovery) on the income statement | $ (4,641) | $ (21,919)

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- Definition The amount of deferred tax assets net of deferred tax liabilities, when the absolute amount of deferred tax assets is greater than the absolute amount of deferred tax liabilities. [Refer: Deferred tax assets; Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_g_i&doctype=Standard -URIDate 2018-03-16 + Details
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