Goodwill And Other Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill And Other Intangible Assets [Line Items]
Payments To Acquire Businesses Gross		$ 2,700
Purchased software costs, capitalized	$ 2,542	3,924	$ 3,720
Non Significant Business [Member]
Goodwill And Other Intangible Assets [Line Items]
Payments To Acquire Businesses Gross		2,700
Purchased Software Costs [Member]
Goodwill And Other Intangible Assets [Line Items]
Purchased software costs, capitalized		$ 3,900	$ 3,700
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