Cash Equivalents (Summary Of Cash Equivalents And Restricted Securities) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Cash and Cash Equivalents [Line Items]
Cost Basis	$ 10,025	$ 10,015
Unrealized Holding Gains	0	0
Estimated Market Value	10,025	10,015
Money market funds
Cash and Cash Equivalents [Line Items]
Cost Basis	10,025	10,015
Unrealized Holding Gains	0	0
Estimated Market Value	$ 10,025	$ 10,015