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Earnings Per Common Share And Share Awards Summary Of Share-Based Award Transactions (Details) - SARs - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				9 Months Ended	12 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award, SARS, Outstanding [Roll Forward]
Number of shares, outstanding beginning balance		42		39	42	39
Number of shares, SARs granted	5	0	4	1	5	5
Number of shares, SARS exercised					(4)	(2)
Number of shares, SARS forfeited or expired					(4)
Number of shares, outstanding ending balance					39	42	39
Number of shares, exercisable as of September 30, 2024					31
Number of shares, unvested as of September 30, 2024					8
Share-based Compensation Arrangement by Share-based Payment Award, SARs, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted average exercise price, outstanding beginning balance		$ 160.83		$ 159.39	$ 160.83	$ 159.39
Weighted average exercise price, SARs granted					160.94	142.88
Weighted average exercise price, SARS exercised					154.13	93.87
Weighted average exercise price, forfeited or expired					192.71
Weighted average exercise price, outstanding ending balance					157.74	$ 160.83	$ 159.39
Weighted average exercise price, exercisable as of September 30, 2024					159.86
Weighted average exercise price, unvested as of September 30,2024					$ 148.86
Average remaining contractual term, outstanding beginning balance					3 years 10 months 6 days	3 years 8 months 8 days	4 years 1 month 6 days
Average remaining contractual term, outstanding ending balance					3 years 10 months 6 days	3 years 8 months 8 days	4 years 1 month 6 days
Average remaining contractual term, exercisable as of September 30, 2024					3 years 7 months 9 days
Average remaining contractual term, unvested as of September 30, 2024					4 years 9 months 29 days
Aggregate intrinsic value, outstanding beginning balance		$ 428		$ 243	$ 428	$ 243
Aggregate intrinsic value, outstanding ending balance					2,783	$ 428	$ 243
Aggregate intrinsic value, exercisable as of September 30, 2024					2,180
Aggregate intrinsic value, unvested as of September 30, 2024					$ 603

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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