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Pension and postretirement benefits - Contributions to the benefit plans (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2024 USD ($)
Pension Plans |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Employer contribution | $ 57
Expected future employer contribution current year | 228
OPEB Plan |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Employer contribution | 1,597
Expected future employer contribution current year | $ 5,744

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