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Income and other taxes - Income tax expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Current tax recovery (expense): |  |
Current period before undernoted items | $ (38,953) | $ (117,496)
Benefit from unrecognised loss carry forwards | 0 | 23,860
Adjustments to prior years | 144 | 2,609
Current tax recovery (expense) | (38,809) | (91,027)
Deferred tax recovery (expense): |  |
Origination and reversal of temporary differences | 31,389 | (56,258)
Adjustments to prior years | (138) | (2,331)
Changes in tax rates | 2,141 | 35
Other | 943 | (3,910)
Deferred tax recovery (expense) | 34,335 | (62,464)
Tax (expense) | $ (4,474) | $ (153,491)

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- Definition The amount of income taxes payable (recoverable) in respect of the taxable profit (tax loss) for a period. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 12 -IssueDate 2019-01-01 -Paragraph 80 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_80_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of benefit arising from a previously unrecognised tax loss, tax credit or temporary difference of a prior period that is used to reduce current tax expense. [Refer: Temporary differences [member]; Unused tax losses [member]; Unused tax credits [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 12 -IssueDate 2019-01-01 -Paragraph 80 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_80_e&doctype=Standard -URIDate 2019-03-27 + Details
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