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Income and other taxes - Change in deferred income tax liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Net |  |
Net, beginning of period | $ (221,682) | $ (164,091)
Deferred income tax recovery (expense) included in net income | 34,335 | (62,464)
Deferred income tax recovery included in other comprehensive income | 22,049 | 3,980
Other | (437) | 893
Net, end of period | (161,206) | (221,682)
Deferred tax assets |  |
Deferred tax assets, beginning of period | 59,532 | 102,341
Deferred income tax recovery (expense) included in net income | 28,875 | (44,277)
Deferred income tax recovery included in other comprehensive income | 21,871 | 1,253
Other | 803 | 215
Deferred tax assets, end of period | 111,614 | 59,532
Deferred tax liabilities |  |
Deferred tax liabilities, beginning of period | (281,214) | (266,432)
Deferred income tax recovery (expense) included in net income | 5,460 | (18,187)
Deferred income tax recovery included in other comprehensive income | 178 | 2,727
Other | (1,240) | 678
Deferred tax liabilities, end of period | (272,820) | (281,214)
Previously stated |  |
Net |  |
Net, beginning of period | (221,682) |
Net, end of period |  | (221,682)
Deferred tax assets |  |
Deferred tax assets, beginning of period | 59,532 |
Deferred tax assets, end of period |  | 59,532
Deferred tax liabilities |  |
Deferred tax liabilities, beginning of period | $ (281,214) |
Deferred tax liabilities, end of period |  | $ (281,214)

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- Definition The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2019-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph o -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_o&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 56 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_56&doctype=Standard -URIDate 2019-03-27 + Details
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