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Acquired Intangible Assets (Schedule of Intangible Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Assets eligible for amortization: |  |  |
Gross Carrying Amount |  | $ 18,222 | $ 16,817
Accumulated Amortization |  | (3,657) | (3,230)
Unamortized intangible assets: |  |  |
Goodwill, Gross Carrying Amount | [1] | 12,796 | 11,817
Goodwill, Accumulated Amortization | [1] | (227) | (227)
Customer Lists [Member] |  |  |
Assets eligible for amortization: |  |  |
Gross Carrying Amount |  | 4,288 | 3,933
Accumulated Amortization |  | (2,702) | (2,342)
Patents [Member] |  |  |
Assets eligible for amortization: |  |  |
Gross Carrying Amount |  | 72 | 72
Accumulated Amortization |  | (12) | (8)
Noncompete Agreements [Member] |  |  |
Assets eligible for amortization: |  |  |
Gross Carrying Amount |  | 332 | 261
Accumulated Amortization |  | (291) | (261)
Software [Member] |  |  |
Assets eligible for amortization: |  |  |
Gross Carrying Amount |  | 234 | 234
Accumulated Amortization |  | (234) | (234)
Other Intangible Assets [Member] |  |  |
Assets eligible for amortization: |  |  |
Gross Carrying Amount |  | 500 | 500
Accumulated Amortization |  | $ (191) | $ (158)
[1] | Amortization through December 31, 2001 prior to adoption of FASB ASC 350.

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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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