Revenue Recognition (Summary Of Revenue Performance Obligations) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Performance Obligations
Revenues	$ 12,391	$ 16,683	$ 42,411	$ 46,657
Percent of Revenues	100.00%	100.00%	100.00%	100.00%
Revenue recognized over time [Member]
Performance Obligations
Revenues	$ 403	$ 1,241	$ 1,041	$ 3,262
Percent of Revenues	3.00%	7.00%	2.00%	7.00%
Revenue recognized at a point in time [Member]
Performance Obligations
Revenues	$ 11,988	$ 15,442	$ 41,370	$ 43,395
Percent of Revenues	97.00%	93.00%	98.00%	93.00%