Intangible Assets and Goodwill (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Finite Lived Intangible Assets [Line Items]
Amortization expense, intangible assets	$ 62	$ 100
Goodwill, Impairment Loss	$ 0	$ 0
Minimum [Member]
Finite Lived Intangible Assets [Line Items]
Finite-Lived intangible asset, useful life	1 year
Maximum [Member]
Finite Lived Intangible Assets [Line Items]
Finite-Lived intangible asset, useful life	8 years