Share-Based Compensation And Share Repurchase Plans (Summary Of Stock Options Outstanding And Exercisable) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Stock Options, Granted	0	0
Weighted Average Exercise Price of Options Outstanding, Granted	$ 1.49	$ 1.92
Weighted Average Remaining Years of Contractual Life	9 years 5 months 8 days	1 year 9 months 14 days	1 year 2 months 26 days	1 year 7 months 28 days
Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Stock Options, Beginning balance	412,779	327,498	517,344
Number of Stock Options, Granted	1,499,755	207,657
Number of Stock Options, Expired	(205,122)	(122,376)	(189,846)
Number of Stock Options Outstanding, Ending balance	1,707,412	412,779	327,498	517,344
Weighted Average Exercise Price of Options Outstanding, Beginning price	$ 14.19	$ 15.87	$ 15.42
Weighted Average Exercise Price of Options Outstanding, Granted	1.49	1.92
Weighted Average Exercise Price of Options Outstanding, Expired			14.63
Weighted Average Exercise Price of Options Outstanding, Ending price	$ 1.63	$ 14.19	$ 15.87	$ 15.42