Stock-Based Compensation And Stock Repurchases (Summary Of Stock Options Outstanding And Exercisable) (Details) - $ / shares	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Stock Options, Granted	0
Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Stock Options, Beginning balance	327,498	517,344
Number of Stock Options, Forfeited	(122,376)	(189,846)
Number of Stock Options Outstanding, Ending balance	205,122	327,498	517,344
Weighted Average Exercise Price of Options Outstanding, Beginning price	$ 15.87	$ 15.42
Weighted Average Exercise Price of Options Outstanding, Forfeited		14.63
Weighted Average Exercise Price of Options Outstanding, Ending price	$ 15.92	$ 15.87	$ 15.42
Weighted Average Remaining Years of Contractual Life	5 months 12 days	1 year 2 months 26 days	1 year 7 months 28 days