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Pension and postretirement benefits - Contributions to the benefit plans (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($)
Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans
Employer contribution	$ 57
Expected future employer contribution current year	227
OPEB Plan
Defined Benefit Plans and Other Postretirement Benefit Plans
Employer contribution	1,645
Expected future employer contribution current year	$ 5,971

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
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- 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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-Topic 715
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No definition available.

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