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v3.25.1

Postretirement benefits (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Net periodic benefit income |  |
Interest cost | $ 397 | $ 435
Expected return on plan assets | (2,137) | (2,099)
Amortization of prior service credit | (355) | (355)
Amortization of net actuarial losses | 212 | 334
Net periodic benefit income | $ (1,883) | $ (1,685)

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