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Pension and postretirement benefits - Contributions to the benefit plans (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2021
Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer contribution	$ 114
Expected future employer contribution current year		$ 229
OPEB Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer contribution	$ 3,030
Expected future employer contribution current year		$ 6,333

X

- Definition

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

+ References

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X

- Definition

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

+ References

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-Publisher FASB
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No definition available.

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