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Operating leases - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Lessee, Lease, Description [Line Items] |  |  |  |
Total lease cost | $ 11,566 | $ 11,896 | $ 36,694 | $ 40,078
Right-of-use assets obtained in exchange for lease obligations | $ 2,100 | $ 1,700 | $ 24,600 | $ 37,600
Weighted average remaining lease term | 6 years 9 months |  | 6 years 9 months |
Weighted average discount rate | 3.15% |  | 3.15% |
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 | $ 33,900 | $ 42,200 | $ 33,900 | $ 42,200
Selling, general and administration costs |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Total lease cost |  |  | 28,100 | 38,100
Direct costs |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Total lease cost |  |  | $ 8,600 | $ 2,000

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