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Financial risk management - Capital Risk Management (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about financial instruments [abstract]        
Total borrowings $ 904,949 $ 1,007,752 $ 817,651  
Total equity 1,265,648 1,163,643 $ 1,047,830 $ 963,724
Total capital $ 2,170,597 $ 2,171,395    
Gearing ratio 42.00% 46.00%