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Income taxes - Summary of unrecognized tax losses (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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2025-2040 | Canada |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | $ 512,102 |
2025-2039 | Canada |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses |  | $ 487,229
Capital losses with no expiry | Canada |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 65,836 | 63,483
2021-2025 | Greece |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 140,196 |
2020-2024 | Greece |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses |  | 98,395
No Expiry | Brazil |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | $ 2,421 | $ 31,128

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- Definition The amount of unused tax losses for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_e&doctype=Standard -URIDate 2020-01-01 + Details
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