Goodwill And Other Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill And Other Intangible Assets [Line Items]
Purchased software costs, capitalized	$ 3,720	$ 1,856	$ 934
Minimum [Member] | Customer Relationships [Member]
Goodwill And Other Intangible Assets [Line Items]
Estimated useful life	10 years
Minimum [Member] | Purchased Software Costs [Member]
Goodwill And Other Intangible Assets [Line Items]
Estimated useful life	2 years
Maximum [Member] | Customer Relationships [Member]
Goodwill And Other Intangible Assets [Line Items]
Estimated useful life	14 years
Maximum [Member] | Purchased Software Costs [Member]
Goodwill And Other Intangible Assets [Line Items]
Estimated useful life	10 years