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Postretirement benefits (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Net periodic benefit income        
Interest cost $ 397 $ 435 $ 1,191 $ 1,306
Expected return on plan assets (2,137) (2,099) (6,410) (6,296)
Amortization of prior service credit (355) (355) (1,066) (1,066)
Amortization of net actuarial losses 212 334 636 1,001
Net periodic benefit income $ (1,883) $ (1,685) $ (5,649) $ (5,055)