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Income taxes - Summary of unrecognized tax losses (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
2025-2040 | Canada    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses $ 490,774  
2025-2039 | Canada    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses   $ 512,102
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 240,081 65,836
2021-2025 | Greece    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 125,401  
2020-2024 | Greece    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses   140,196
No Expiry | Brazil    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses $ 0 $ 2,421