Revenue Recognition (Summary Of Revenue Performance Obligations) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Performance Obligations
Revenues	$ 17,732	$ 16,429
Percent of Revenues	100.00%	100.00%
Revenue recognized over time [Member]
Performance Obligations
Revenues	$ 403	$ 193
Percent of Revenues	2.30%	1.20%
Revenue recognized at a point in time [Member]
Performance Obligations
Revenues	$ 17,329	$ 16,236
Percent of Revenues	97.70%	98.80%