Revenue Recognition (Summary Of Revenue Performance Obligations) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Performance Obligations
Revenues	$ 15,996	$ 15,044	$ 32,425	$ 30,020
Percent of Revenues	100.00%	100.00%	100.00%	100.00%
Revenue recognized over time [Member]
Performance Obligations
Revenues	$ 362	$ 292	$ 555	$ 638
Percent of Revenues	2.00%	2.00%	2.00%	2.00%
Revenue recognized at a point in time [Member]
Performance Obligations
Revenues	$ 15,634	$ 14,752	$ 31,870	$ 29,382
Percent of Revenues	98.00%	98.00%	98.00%	98.00%