Leases (Summary Of Lease Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Leases [Abstract]
Amortization of property and equipment	$ 155	$ 161	$ 310	$ 323
Interest expense on finance leases	28	29	57	58
Total finance lease expense	183	190	367	381
Operating lease expense	1,809	1,769	3,575	3,518
Sublease income	(92)	(226)	(216)	(452)
Total lease expense	$ 1,900	$ 1,733	$ 3,726	$ 3,447