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Postretirement benefits (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Net periodic benefit income |  |  |  |
Interest cost | $ 496 | $ 280 | $ 993 | $ 561
Expected return on plan assets | (1,830) | (1,866) | (3,660) | (3,731)
Amortization of prior service credit | (355) | (355) | (711) | (711)
Amortization of net actuarial losses | 568 | 225 | 1,137 | 450
Net periodic benefit income | $ (1,121) | $ (1,716) | $ (2,241) | $ (3,431)

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