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Pension and Other Post-Retirement Benefits - Projected benefit obligations, the plan assets, and the funded status (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Change in benefit obligation
Service costs	$ 368	$ 226	$ 1,104	$ 661
Interest cost	$ 82	$ 79	$ 246	$ 235

X

- Definition

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

+ References

No definition available.

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X

- Definition

Amount of cost recognized for passage of time related to defined benefit plan.

+ References

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- Definition

Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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