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Income taxes - Summary of Unrecognized Tax Losses (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Tax effect of total losses not recognized | $ 169,498 | $ 160,052
Canada |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Tax effect of total losses not recognized | 140,087 |
Brazil |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Tax effect of total losses not recognized | 5,797 |
Greece |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Tax effect of total losses not recognized | 23,614 |
2020 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 24,745 |
2020 | Greece |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 24,745 |
2021 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 10,253 |
2021 | Greece |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 10,253 |
2022 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 7,856 |
2022 | Greece |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 7,856 |
2023 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 17,347 |
2023 | Greece |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 17,347 |
2024 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 38,194 |
2024 | Greece |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 38,194 |
2025 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 7,894 |
2025 | Canada |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 7,894 |
2026 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 14,966 |
2026 | Canada |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 14,966 |
2027 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 10,638 |
2027 | Canada |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 10,638 |
2028 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 25,971 |
2028 | Canada |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 25,971 |
2029 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 23,444 |
2029 | Canada |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 23,444 |
2030 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 7,282 |
2030 | Canada |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 7,282 |
2031 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 45,351 |
2031 | Canada |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 45,351 |
2032 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 74,855 |
2032 | Canada |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 74,855 |
2033 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 64,883 |
2033 | Canada |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 64,883 |
2034 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 58,689 |
2034 | Canada |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 58,689 |
2035 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 55,266 |
2035 | Canada |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 55,266 |
2036 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 50,503 |
2036 | Canada |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 50,503 |
2037 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 38,978 |
2037 | Canada |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 38,978 |
2038 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 7,999 |
2038 | Canada |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 7,999 |
2039 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 510 |
2039 | Canada |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 510 |
No Expiry |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 31,128 |
No Expiry | Brazil |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 31,128 |
Tax Losses Carried Forward |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 616,752 |
Tax Losses Carried Forward | Canada |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 487,229 |
Tax Losses Carried Forward | Brazil |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 31,128 |
Tax Losses Carried Forward | Greece |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 98,395 |
Capital losses with no expiry |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 63,483 |
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 | $ 63,483 |

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