Revenue Recognition (Schedule Of Contract Assets And Liabilities) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Opening [Member]
Contract Receivables and Liabilities [Line Items]
Receivables	$ 9	$ 310	$ 326	$ 305
Contract Liabilities	2,193	242	663	219
Closing [Member]
Contract Receivables and Liabilities [Line Items]
Receivables		308		308
Contract Liabilities	2,014	228	2,014	228
Increase/(Decrease) [Member]
Contract Receivables and Liabilities [Line Items]
Receivables	(9)	(2)	(326)	3
Contract Liabilities	$ (179)	$ (14)	$ 1,351	$ 9