Leases (Summary Of Lease Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Amortization of property and equipment	$ 164	$ 188	$ 487	$ 608
Interest expense on finance leases	30	30	89	93
Total finance lease expense	194	218	576	701
Operating lease expense	1,806	1,717	5,324	4,870
Sublease income	(226)	(227)	(679)	(679)
Total lease expense	$ 1,774	$ 1,708	$ 5,221	$ 4,892