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Acquired Intangible Assets (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items]      
Amortization of intangible assets $ 427 $ 408 $ 408
2018 442    
2019 412    
2020 406    
2021 406    
2022 88    
Recorded intangible assets 1,405    
Customer Lists [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Recorded intangible assets $ 355    
Customer Lists [Member] | Minimum [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Amortization period 7 years    
Customer Lists [Member] | Maximum [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Amortization period 10 years    
Patents [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Amortization period 18 years    
Noncompete Agreements [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Recorded intangible assets $ 71    
Noncompete Agreements [Member] | Minimum [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Amortization period 2 years    
Noncompete Agreements [Member] | Maximum [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Amortization period 5 years    
Software [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Amortization period 3 years    
Other Intangible Assets [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Amortization period 15 years    
Goodwill [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Recorded intangible assets $ 979