Share-Based Compensation And Share Repurchase Plans (Summary Of Vested And Unvested Stock Options) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average remaining years of contractual life, Vested	8 years 11 months 8 days	6 months 21 days	1 year 2 months 1 day
Weighted average remaining years of contractual life, Nonvested	9 years 5 months 8 days	1 year 9 months 14 days	1 year 2 months 26 days
Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested	207,657	205,122	276,218
Weighted average exercise price, Vested	$ 0.48	$ 15.92	$ 15.81
Unvested	1,499,755	207,657	51,281
Weighted average exercise price, Nonvested	$ 1.62	$ 4.54	$ 16.15