Revenue Recognition (Schedule Of Contract Assets And Liabilities) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Opening [Member]
Contract Receivables and Liabilities [Line Items]
Receivables	$ 1,269	$ 1,103
Contract Liabilities	2,986	2,200
Closing [Member]
Contract Receivables and Liabilities [Line Items]
Receivables	586	472
Contract Liabilities	2,937	2,227
Increase/(Decrease) [Member]
Contract Receivables and Liabilities [Line Items]
Receivables	(683)	(631)
Contract Liabilities	$ (49)	$ 27