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Share-based payments - (Benefit) expense recognized in retention plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Share-based payments      
(Benefit) expense arising from cash-settled share-based payments transactions $ (119) $ (4,365) $ (2,984)
Expense arising from equity-settled share-based payments transactions 6,048 5,074 4,410
Total expense arising from share-based payments transactions $ 5,929 $ 709 $ 1,426