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Operating leases - Schedule of Lease Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Leases [Abstract]        
Operating lease costs $ 11,850 $ 12,164 $ 37,539 $ 40,976
Income from sub-leases (284) (268) (845) (898)
Net operating lease costs $ 11,566 $ 11,896 $ 36,694 $ 40,078