Leases (Summary Of Lease Costs) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Leases [Abstract]
Amortization of property and equipment	$ 209	$ 420
Interest expense on finance leases	31	63
Total finance lease expense	240	483
Operating lease expense	1,589	3,153
Sublease income	(226)	(452)	$ (910)
Total lease expense	$ 1,603	$ 3,184