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Pension Benefits - Component of net periodic benefit cost (Details) - Defined Benefit Pension Items - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Components of net periodic benefit cost
Service cost	$ 250	$ 258
Interest cost	429	435
Expected return on plan assets	(1,032)	(1,034)
Net periodic pension benefit	$ (353)	$ (341)

X

- Definition

Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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- Definition

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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