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Operating leases - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Lessee, Lease, Description [Line Items]    
Total lease cost $ 14,937 $ 7,578
Early termination options reasonably certain to be exercised 0 4,200
Right-of-use assets obtained in exchange for lease obligations $ 6,800 $ 2,900
Weighted average remaining lease term 6 years 11 months 1 day  
Weighted average discount rate 2.48%  
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Other Liabilities Other Liabilities
Other liabilities    
Lessee, Lease, Description [Line Items]    
Operating lease liabilities $ 48,600 $ 23,800
Selling, general and administration costs    
Lessee, Lease, Description [Line Items]    
Total lease cost 48,000 7,000
Direct costs    
Lessee, Lease, Description [Line Items]    
Total lease cost $ 600 $ 600