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Employee benefit plans - Schedule of Net Defined Benefit Plan Costs (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Retirement Benefits [Abstract] |  |  |  |
Service costs | $ 6,036 | $ 4,659 | $ 12,148 | $ 9,551
Interest costs | 2,683 | 2,194 | 5,452 | 4,353
Amortization of actuarial loss | 95 | 77 | 190 | 151
Amortization of prior service cost | 748 | 0 | 1,359 | 0
Expected return on plan assets | (2,075) | (1,743) | (4,266) | (3,450)
Net defined benefit plan costs | $ 7,487 | $ 5,187 | $ 14,883 | $ 10,605

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