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Income taxes - Summary of unrecognized tax losses (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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2029-2042 | Canada |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | $ 448,935 |
2026-2041 | Canada |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses |  | $ 490,774
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 | 229,146 | 240,081
2023-2027 | Greece |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | 177,188 |
2022-2026 | Greece |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses |  | 125,401
2023-2029 | Romania |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses | $ 1,837 |
2022-2028 | Romania |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of the tax losses |  | $ 1,817

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