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Pension and other post-retirement benefits- Change in Plan Assets (Details) - Level 3 - Private Equity Funds $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets, beginning of year	$ 7,745
Contributions into funds	6,233
Unrealized gains	4,257
Distributions	(921)
Fair value of plan assets, end of year	$ 17,314

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- Definition

Defined Benefit Plan, Plan Assets, Contributions

+ References

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Defined Benefit Plan, Plan Assets, Unrealized Gains

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

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-SubTopic 20
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- Definition

Amount, measured using unobservable input, of decrease in plan asset of defined benefit plan from settlement of trade associated with underlying investment.

+ References

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