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Share-based payments - Board of Directors Incentive Plan (BoDIP) (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Dec. 31, 2023
USD ($)
EquityInstruments
shares
Apr. 30, 2018
Dec. 31, 2023
EquityInstruments
$ / shares
shares
Dec. 31, 2022
EquityInstruments
$ / shares
shares
Dec. 31, 2021
EquityInstruments
$ / shares
Share-based payments          
Treasury shares | shares 14,525,694   14,525,694 13,452,393  
BODIP          
Share-based payments          
Vesting period   5 years 5 years    
Exercise price | $ / shares     $ 21.14 $ 33.80 $ 32.23
Shares available to be exercised | EquityInstruments 4,781,769   4,781,769 5,945,417 4,589,726
Treasury shares | shares 370,860   370,860    
Cost of extensions to LTIP approved | $ $ 640        
Cost of extensions net of withheld taxes | $ $ 452