Leases (Summary Of Lease Costs) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Leases [Abstract]
Amortization of property and equipment	$ 162	$ 211
Interest expense on finance leases	29	32
Total finance lease expense	191	243
Operating lease expense	1,748	1,550
Sublease income	(226)	(228)
Total lease expense	$ 1,713	$ 1,565