Cash Equivalents (Summary Of Cash Equivalents And Restricted Securities) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Cash and Cash Equivalents [Line Items]
Cost Basis	$ 10,051	$ 10,015
Unrealized Holding Gains	0	0
Estimated Market Value	10,051	10,015
Money market funds
Cash and Cash Equivalents [Line Items]
Cost Basis	10,051	10,015
Unrealized Holding Gains	0	0
Estimated Market Value	$ 10,051	$ 10,015