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Operating leases - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Lessee, Lease, Description [Line Items]          
Total lease cost $ 8,986 $ 12,535 $ 21,813 $ 25,128  
Right-of-use assets obtained in exchange for lease obligations $ 11,000 10,200 $ 46,600 22,500  
Weighted average remaining lease term 6 years 10 months 6 days   6 years 10 months 6 days   6 years 8 months 19 days
Weighted average discount rate 3.71%   3.71%   3.29%
Operating lease liabilities, current $ 36,300   $ 36,300   $ 36,400
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Other Liabilities   Other Liabilities   Other Liabilities
Operating lease liabilities, non-current $ 145,464   $ 145,464   $ 126,321
Selling, general and administration costs          
Lessee, Lease, Description [Line Items]          
Total lease cost 8,000 9,300 18,000 19,300  
Direct costs          
Lessee, Lease, Description [Line Items]          
Total lease cost $ 1,000 $ 3,200 $ 3,800 $ 5,800