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Operating leases - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Lessee, Lease, Description [Line Items] |  |  |  |  |
Total lease cost | $ 8,986 | $ 12,535 | $ 21,813 | $ 25,128 |
Right-of-use assets obtained in exchange for lease obligations | $ 11,000 | 10,200 | $ 46,600 | 22,500 |
Weighted average remaining lease term | 6 years 10 months 6 days |  | 6 years 10 months 6 days |  | 6 years 8 months 19 days
Weighted average discount rate | 3.71% |  | 3.71% |  | 3.29%
Operating lease liabilities, current | $ 36,300 |  | $ 36,300 |  | $ 36,400
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Other Liabilities |  | Other Liabilities |  | Other Liabilities
Operating lease liabilities, non-current | $ 145,464 |  | $ 145,464 |  | $ 126,321
Selling, general and administration costs |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Total lease cost | 8,000 | 9,300 | 18,000 | 19,300 |
Direct costs |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Total lease cost | $ 1,000 | $ 3,200 | $ 3,800 | $ 5,800 |

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