Leases (Summary Of Lease Costs) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Amortization of property and equipment	$ 154	$ 162
Interest expense on finance leases	29	29
Total finance lease expense	183	191
Operating lease expense	1,758	1,748
Sublease income	(124)	(226)
Total lease expense	$ 1,817	$ 1,713