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Financial risk management - Capital Risk Management (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about financial instruments [abstract]        
Total borrowings $ 1,007,752 $ 817,651 $ 971,090  
Total equity 1,163,643 1,047,830 $ 963,724 $ 1,028,883
Total capital $ 2,171,395 $ 1,865,481    
Gearing ratio 46.00% 44.00%