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Components of Net Periodic Benefit Cost - Employer Contributions (Details) - USD ($)	6 Months Ended
	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Defined Benefit Plan Disclosure
Amount of potential discretionary contributions accrued to a defined contribution plan	$ 1,600,000		$ 1,300,000
Pension Benefits
Defined Benefit Plan Disclosure
Expected future benefit payment		$ 3,900,000
Contributions by employer	526,000
Pension Benefits | Employee Stock Option
Defined Benefit Plan Disclosure
Expected future benefit payment		604,000
Contributions by employer	0
Postretirement Health Coverage
Defined Benefit Plan Disclosure
Expected future benefit payment		$ 249,000
Contributions by employer	$ 134,000

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Carrying value as of the balance sheet date of obligations, excluding pension and other postretirement benefits, incurred through that date and payable for perquisites provided to employees pertaining to services received from them. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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