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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.