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Postretirement benefits (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Net periodic benefit income        
Interest cost $ 435 $ 496 $ 1,306 $ 1,489
Expected return on plan assets (2,099) (1,830) (6,296) (5,490)
Amortization of prior service credit (355) (355) (1,066) (1,066)
Amortization of net actuarial losses 334 568 1,001 1,705
Net periodic benefit income $ (1,685) $ (1,121) $ (5,055) $ (3,362)