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v3.23.3

Postretirement benefits (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Net periodic benefit income |  |  |  |
Interest cost | $ 496 | $ 280 | $ 1,489 | $ 841
Expected return on plan assets | (1,830) | (1,866) | (5,490) | (5,596)
Amortization of prior service credit | (355) | (355) | (1,066) | (1,066)
Amortization of net actuarial losses | 568 | 225 | 1,705 | 674
Net periodic benefit income | $ (1,121) | $ (1,716) | $ (3,362) | $ (5,147)

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