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Operating leases - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Lessee, Lease, Description [Line Items]        
Total lease cost $ 13,245 $ 7,329 $ 28,182 $ 14,907
Early termination options reasonably certain to be exercised 0 0 0 4,200
Right-of-use assets obtained in exchange for lease obligations $ 29,000 $ 1,000 $ 35,800 $ 3,800
Weighted average remaining lease term 6 years 9 months 25 days   6 years 9 months 25 days  
Weighted average discount rate 2.65%   2.65%  
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Other Liabilities Other Liabilities Other Liabilities Other Liabilities
Other liabilities        
Lessee, Lease, Description [Line Items]        
Operating lease liabilities $ 47,000 $ 22,800 $ 47,000 $ 22,800
Selling, general and administration costs        
Lessee, Lease, Description [Line Items]        
Total lease cost     27,100 13,800
Direct costs        
Lessee, Lease, Description [Line Items]        
Total lease cost     $ 1,100 $ 1,100