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Financial instruments - Fair values and risk management - Cash flow sensitivity analysis for variable rate instruments (Details) - VARIABLE RATE INSTRUMENTS - Interest rate risk - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items]      
Increase in risk variable, impact on profit (loss) $ (7,130) $ (7,784) $ (6,606)
Decrease in risk variable, impact on profit (loss) 7,129 6,466 2,133
Increase in risk variable, impact on equity 1,376 4,710 4,594
Decrease in risk variable, impact on equity (1,376) (6,839) (4,222)
Variable rate instruments      
Disclosure of detailed information about financial instruments [line items]      
Increase in risk variable, impact on profit (loss) (7,130) (7,784) (6,606)
Decrease in risk variable, impact on profit (loss) 7,129 6,466 2,133
Increase in risk variable, impact on equity 0 0 0
Decrease in risk variable, impact on equity 0 0 0
Interest rate swaps      
Disclosure of detailed information about financial instruments [line items]      
Increase in risk variable, impact on profit (loss) 0 0 0
Decrease in risk variable, impact on profit (loss) 0 0 0
Increase in risk variable, impact on equity 1,376 4,710 4,594
Decrease in risk variable, impact on equity $ (1,376) $ (6,839) $ (4,222)