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Earnings Per Common Share And Share Awards (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended		12 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Earnings Per Common Share And Share Awards [Line Items]
Anti-dilutive shares excluded from computation of diluted earnings per share	0			24			4	24
Number of SARs granted where exercise price was less than market price on date of grant							0	0
SARs
Earnings Per Common Share And Share Awards [Line Items]
Share-based compensation arrangement by share-based payment award, grants in period, net of forfeitures		5	0		4	1	5		5
Share-based payment arrangement, expense	$ 296			$ 337			$ 128	$ 117
Share-based payment arrangement, nonvested award, cost not yet recognized, amount	$ 399						$ 399
Share-based compensation arrangement by share-based payment award, grants in period, weighted average grant date fair value							$ 64.00	$ 55.52
Maximum | SARs
Earnings Per Common Share And Share Awards [Line Items]
Share-based compensation arrangement by share-based payment award, shares purchased for award							250
SARs expiration period							7 years
SARs vesting period							5 years

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Earnings Per Common Share And Share Awards [Line Items]

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

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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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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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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