Revenue Recognition (Schedule of Contract Assets and Liabilities) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Opening [Member]
Contract Receivables and Liabilities [Line Items]
Receivables	$ 310	$ 260	$ 305	$ 266
Contract Liability	242	193	219	235
Closing [Member]
Contract Receivables and Liabilities [Line Items]
Receivables	308	281	308	281
Contract Liability	228	236	228	236
Increase/(Decrease) [Member]
Contract Receivables and Liabilities [Line Items]
Receivables	(2)	21	3	15
Contract Liability	$ (14)	$ 43	$ 9	$ 1