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Pension and postretirement benefits - Contributions to the benefit plans (Details) $ in Thousands	3 Months Ended
	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

X

- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Amount of contributions received and expected to be received by defined benefit plan from employer in current fiscal year.

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