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v3.22.2.2

Postretirement benefits (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Net periodic benefit income |  |  |  |
Interest cost | $ 280 | $ 242 | $ 841 | $ 726
Expected return on plan assets | (1,866) | (1,875) | (5,596) | (5,623)
Amortization of prior service credit | (355) | (355) | (1,066) | (1,066)
Amortization of net actuarial losses | 225 | 407 | 674 | 1,221
Net periodic benefit income | $ (1,716) | $ (1,581) | $ (5,147) | $ (4,742)

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