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Income taxes - Summary of unrecognized tax losses (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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2030-2043 | Canada |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | $ 464,761 |
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 | 258,795 | $ 229,146
2024-2028 | Greece |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 182,444 |
2024-2030 | Romania |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | $ 6,811 |
2029-2042 | Canada |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses |  | 448,935
2023-2027 | Greece |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses |  | 177,188
2023-2029 | Romania |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses |  | $ 1,837

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