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Share-based payments - (Benefit) expense recognized in retention plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Share-based payments      
(Benefit) expense arising from cash-settled share-based payments transactions   $ (2,984) $ 5,362
Expense arising from cash-settled share-based payments transactions $ (4,365)    
Expense arising from equity-settled share-based payments transactions 5,074 4,410 3,519
Total expense arising from share-based payments transactions 709 $ 1,426 $ 8,881
LTIP - SARs [Member]      
Share-based payments      
(Benefit) expense arising from cash-settled share-based payments transactions $ (95)