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Shareholders' equity - Schedule of changes in share capital (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Disclosure of classes of share capital [line items]        
Common shares (in shares) 2,477,672 2,477,672 2,477,672 2,477,672
Equity $ 895,047 $ 842,033 $ 785,761 $ 727,845
Total        
Disclosure of classes of share capital [line items]        
Equity 380,478 380,478 380,478 380,478
Share capital        
Disclosure of classes of share capital [line items]        
Equity 21,198 21,198 21,198 21,198
Share premium        
Disclosure of classes of share capital [line items]        
Equity $ 359,280 $ 359,280 $ 359,280 $ 359,280