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Operating leases - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Lessee, Lease, Description [Line Items] |  |  |  |  |
Total lease cost | $ 10,618 | $ 8,986 | $ 21,049 | $ 21,813 |
Right-of-use assets obtained in exchange for lease obligations | $ 2,800 | 11,000 | $ 9,800 | 46,600 |
Weighted average remaining lease term | 6 years 7 days |  | 6 years 7 days |  | 6 years 6 months 21 days
Weighted average discount rate | 3.97% |  | 3.97% |  | 4.01%
Operating lease liabilities, current | $ 38,700 |  | $ 38,700 |  | $ 36,800
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Other Liabilities |  | Other Liabilities |  | Other Liabilities
Operating lease liabilities, non-current | $ 132,713 |  | $ 132,713 |  | $ 140,085
Selling, general and administration costs |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Total lease cost | 9,200 | 8,000 | 18,100 | 18,000 |
Direct costs |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Total lease cost | $ 1,400 | $ 1,000 | $ 2,900 | $ 3,800 |

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