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Intangible Assets (Schedule of Company's Intangible Assets) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Unamortized intangible assets:    
Goodwill, Gross Carrying Amount [1] $ 11,817 $ 11,817
Goodwill, Accumulated Amortization [1] (227) (227)
Total intangible assets 17,891 16,817
Accumulated Amortization (3,329) (3,230)
Customer Lists [Member]    
Assets eligible for amortization:    
Gross Carrying Amount 4,907 3,933
Accumulated Amortization (2,429) (2,342)
Patents [Member]    
Assets eligible for amortization:    
Gross Carrying Amount 72 72
Accumulated Amortization (9) (8)
Non-compete Agreements [Member]    
Assets eligible for amortization:    
Gross Carrying Amount 361 261
Accumulated Amortization (263) (261)
Software [Member]    
Assets eligible for amortization:    
Gross Carrying Amount 234 234
Accumulated Amortization (234) (234)
Other [Member]    
Assets eligible for amortization:    
Gross Carrying Amount 500 500
Accumulated Amortization $ (167) $ (158)
[1] Amortization through December 31, 2001 prior to adoption of FASB ASC 350.