Revenue Recognition (Schedule of Contract Assets and Liabilities) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Opening [Member]
Contract Receivables and Liabilities [Line Items]
Receivables	$ 320	$ 286	$ 305	$ 266
Contract Liability	214	212	219	235
Closing [Member]
Contract Receivables and Liabilities [Line Items]
Receivables	310	260	310	260
Contract Liability	242	193	242	193
Increase/(Decrease) [Member]
Contract Receivables and Liabilities [Line Items]
Receivables	(10)	(26)	5	(6)
Contract Liability	$ 28	$ (19)	$ 23	$ (42)