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Operating leases - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Lessee, Lease, Description [Line Items] |  |  |  |  |
Total lease cost | $ 11,473 | $ 11,923 | $ 32,522 | $ 33,736 |
Right-of-use assets obtained in exchange for lease obligations | $ 4,100 | 13,300 | $ 13,900 | 59,900 |
Weighted average remaining lease term | 5 years 11 months 19 days |  | 5 years 11 months 19 days |  | 6 years 6 months 21 days
Weighted average discount rate | 3.95% |  | 3.95% |  | 4.01%
Operating lease liabilities, current | $ 38,100 |  | $ 38,100 |  | $ 36,800
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Other Liabilities |  | Other Liabilities |  | Other Liabilities
Operating lease liabilities, non-current | $ 125,110 |  | $ 125,110 |  | $ 140,085
Selling, general and administration costs |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Total lease cost | 9,800 | 10,600 | 27,900 | 28,600 |
Direct costs |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Total lease cost | $ 1,700 | $ 1,300 | $ 4,600 | $ 5,100 |

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