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Operating leases - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Lessee, Lease, Description [Line Items]      
Total lease cost $ 10,431 $ 12,827  
Right-of-use assets obtained in exchange for lease obligations $ 7,000 35,600  
Weighted average remaining lease term 6 years 3 months 29 days   6 years 6 months 21 days
Weighted average discount rate 3.93%   4.01%
Operating lease liabilities, current $ 36,400   $ 36,800
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Other Liabilities   Other Liabilities
Operating lease liabilities, non-current $ 138,354   $ 140,085
Selling, general and administration costs      
Lessee, Lease, Description [Line Items]      
Total lease cost 8,900 10,000  
Direct costs      
Lessee, Lease, Description [Line Items]      
Total lease cost $ 1,500 $ 2,800