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Acquired Intangible Assets (Schedule of Intangible Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets eligible for amortization: |  |  |
Gross Carrying Amount |  | $ 18,222 | $ 18,222
Accumulated Amortization |  | (4,099) | (3,657)
Unamortized intangible assets: |  |  |
Goodwill, Gross Carrying Amount | [1] | 12,796 | 12,796
Goodwill, Accumulated Amortization | [1] | (227) | (227)
Customer Lists [Member] |  |  |
Assets eligible for amortization: |  |  |
Gross Carrying Amount |  | 4,288 | 4,288
Accumulated Amortization |  | (3,071) | (2,702)
Patents [Member] |  |  |
Assets eligible for amortization: |  |  |
Gross Carrying Amount |  | 72 | 72
Accumulated Amortization |  | (16) | (12)
Noncompete Agreements [Member] |  |  |
Assets eligible for amortization: |  |  |
Gross Carrying Amount |  | 332 | 332
Accumulated Amortization |  | (326) | (291)
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 |  | $ (225) | $ (191)
[1] | Amortization through December 31, 2001 prior to adoption of FASB ASC 350.

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