Pension and Other Postretirement Benefits - Other Postretirement Benefits (Details) - Other Postretirement Benefit Plan - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Pension Benefits
Service cost	$ 4	$ 8
Interest cost	272	375
Amortization of actuarial loss	174	486
Net periodic pension (income)/cost or postretirement benefit cost	$ 450	$ 869

Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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

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Amount of net periodic benefit cost (credit) for defined benefit plan.

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

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