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Pension Benefits - Component of net periodic benefit cost (Details) - Pension Plan - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
COMPONENTS OF NET PERIODIC BENEFIT COST:
Service cost	$ 211,000	$ 327,000	$ 628,000	$ 841,000
Interest cost	369,000	514,000	1,173,000	1,384,000
Expected return on plan assets	(1,051,000)	(1,124,000)	(3,119,000)	(3,192,000)
Amortization of net loss		29,000		29,000
Settlement charge	34,000	0	410,000	0
Net periodic pension benefit	$ (437,000)	$ (254,000)	$ (908,000)	$ (938,000)

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- Definition

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

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

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Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement.

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