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Financial risk management - Estimation of fair value (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Level 3 | Freight prices    
Financial risk management    
Percentage of reasonably possible increase in unobservable input 5.00% 5.00%
Increase (decrease) in profit after tax derived from physical commodity contracts due to increase in input $ (6,800) $ (6,300)
Percentage of reasonably possible decrease in unobservable input (5.00%) (5.00%)
Increase (decrease) in profit after tax derived from physical commodity contracts due to decrease in input $ 6,800 $ 6,300
Financial liabilities, at FVPL    
Financial risk management    
Financial liabilities 24,809 26,096
Financial liabilities, at FVPL | Level 2    
Financial risk management    
Financial liabilities 13,836 12,166
Financial liabilities, at FVPL | Level 3    
Financial risk management    
Financial liabilities 10,973 13,930
Financial liabilities, at FVPL | Derivatives    
Financial risk management    
Financial liabilities 24,809 26,096
Financial liabilities, at FVPL | Derivatives | Level 2    
Financial risk management    
Financial liabilities 13,836 12,166
Financial liabilities, at FVPL | Derivatives | Level 3    
Financial risk management    
Financial liabilities 10,973 13,930
Financial assets, at FVOCI | Equity financial assets    
Financial risk management    
Financial assets 11,710 23,132
Financial assets, at FVOCI | Equity financial assets | Level 1    
Financial risk management    
Financial assets 11,710 23,132
Financial assets, at FVPL | Equity financial assets    
Financial risk management    
Financial assets 1,597 2,769
Financial assets, at FVPL | Equity financial assets | Level 3    
Financial risk management    
Financial assets 1,597 2,769
Financial assets, at FVPL | Derivatives    
Financial risk management    
Financial assets 29,011 82,040
Financial assets, at FVPL | Derivatives | Level 2    
Financial risk management    
Financial assets 9,179 16,475
Financial assets, at FVPL | Derivatives | Level 3    
Financial risk management    
Financial assets 19,832 65,565
Financial assets, at FVPL and FVOCI    
Financial risk management    
Financial assets 42,318 107,941
Financial assets, at FVPL and FVOCI | Level 1    
Financial risk management    
Financial assets 11,710 23,132
Financial assets, at FVPL and FVOCI | Level 2    
Financial risk management    
Financial assets 9,179 16,475
Financial assets, at FVPL and FVOCI | Level 3    
Financial risk management    
Financial assets $ 21,429 $ 68,334