Summary of Significant Accounting Policies (Schedule Of Allowance For Doubtful Accounts) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of Beginning of Year	[1]	$ 514	$ 788	$ 1,371
Charges to Operations	[1]	1,321	489	0
Deductions	[1]	(1,365)	(763)	(583)
Balance as of End of Year	[1]	$ 470	$ 514	$ 788

[1] Deductions in the allowance for doubtful accounts represent write-offs, net of recoveries, of amounts determined to be uncollectible.