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Financial instruments - Fair values and risk management - Interest rate risk (Details) - Interest rate risk - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
FIXED RATE INSTRUMENTS    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic $ 239,658 $ 313,284
VARIABLE RATE INSTRUMENTS    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 691,905 1,383,847
Financial liabilities | FIXED RATE INSTRUMENTS    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 238,808 312,434
Financial liabilities | VARIABLE RATE INSTRUMENTS    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 691,905 1,383,847
Financial assets | FIXED RATE INSTRUMENTS    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic $ 850 $ 850