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Income taxes - Summary of unrecognized tax losses (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
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