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Operating leases - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Lessee, Lease, Description [Line Items] |  |  |
Total lease cost | $ 12,827 | $ 12,593 |
Right-of-use assets obtained in exchange for lease obligations | $ 35,600 | $ 12,300 |
Weighted average remaining lease term | 7 years 2 months 1 day |  | 6 years 8 months 19 days
Weighted average discount rate | 3.73% |  | 3.29%
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Other Liabilities | Other Liabilities |
Other liabilities |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating lease liabilities | $ 36,100 | $ 36,400 |
Selling, general and administration costs |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Total lease cost | 10,000 | 10,000 |
Direct costs |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Total lease cost | $ 2,800 | $ 2,600 |

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