Leases (Summary Of Lease Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Leases [Abstract]
Amortization of property and equipment	$ 190	$ 164	$ 500	$ 487
Interest expense on finance leases	27	30	85	89
Total finance lease expense	217	194	585	576
Operating lease expense	1,989	1,806	5,566	5,324
Sublease income	(92)	(226)	(308)	(679)
Total lease expense	$ 2,114	$ 1,774	$ 5,843	$ 5,221