The maximum amount of compensation expense incurred on the reporting period.

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Estimated amount of compensation expense excepted to be recorded.

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- Definition

Number of shares issued to directors in lieu of cash fees.

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- Definition

The period of performance for options under LTIP.

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- Definition

Share based compensation reduction Of expense

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- Definition

Description about the Period in which option vested or expired.

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No definition available.

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Total expense related to director stock in lieu of cash fees.

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- Definition

Unrecognized compensation expense of reporting period.

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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Number of shares authorized for issuance under share-based payment arrangement.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Stock Compensation Plans - Additional information (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	28,175		28,175		28,175
Stock Option Period, Description			All options expire ten years from the date of grant. Vested options of retirees expire on the earlier of the scheduled expiration date or one year after the retirement date.
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			0	0
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition			1 month
Director [Member]
Stock Issued During Period, Shares, Issued for Services			0	1,985
Adjustments To Additional Paid In Capital Stock Issued Issuance Costs			$ 0	$ 39,000
Executive Long-Term Equity Incentive Plan [Member]
Stock Option Period, Description			The value of PSU awards issued in 2022, 2023 and 2024 under the Executive LTIP will be determined individually at the end of each respective 36 month performance period ending December 31. The benefits earned under these PSUs will be paid out in equity in the first quarter following the end of the performance period. The participants will receive all or a portion of the award if their employment is terminated by the Company without cause, by the participant in certain situations, or by death, disability or retirement of the participant.
Share-based Compensation, Performance Period			3 years
Executive Long-Term Equity Incentive Plan [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate	20.00%		20.00%
Executive Long-Term Equity Incentive Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate	50.00%		50.00%
Equity Plan 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	900,000		900,000
Long Term Equity Incentive Plan 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	1,200,000		1,200,000
Performance Stock Units PSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			82,737
Estimated Compensation Expense Excepted	$ 3,800,000		$ 3,800,000
Unrecognized Compensation Expense	2,600,000		2,600,000
Reduction of expense	252,000	$ 201,000	428,000	539,000
Performance Stock Units PSUs [Member] \| Maximum [Member]
Compensation Expense, Maximum	5,700,000		$ 5,700,000
Performance Stock Units PSUs [Member] \| Executive Long-Term Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			82,737
Restricted Stock Awards (RSA) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			92,013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			7,404
Allocated Share-based Compensation Expense	$ 480,000	$ 482,000	$ 998,000	$ 928,000
Restricted Stock Awards (RSA) [Member] \| Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			24,768
Restricted Stock Awards (RSA) [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			1 year
Restricted Stock Awards (RSA) [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			3 years
Restricted Stock Awards (RSA) [Member] \| Executive Long-Term Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			28,702
Restricted Stock Awards (RSA) [Member] \| Key Long Term Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			31,139	25,044
Restricted Stock Units (RSUs) [Member] \| Key Long Term Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			3 years
Restricted Stock Units (RSUs) [Member] \| Key Long Term Equity Incentive Plan [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate	5.00%		5.00%
Restricted Stock Units (RSUs) [Member] \| Key Long Term Equity Incentive Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate	10.00%		10.00%
Short Term Incentive Plan [Member]
Allocated Share-based Compensation Expense			$ 1,300,000		$ 1,900,000