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Income taxes - Summary of unrecognized tax losses (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
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