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Intangible Assets and Goodwill (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Finite Lived Intangible Assets [Line Items]        
Amortization expense, intangible assets     $ 184 $ 200
Goodwill, Impairment Loss $ 0 $ 0 $ 0 $ 0
Minimum [Member]        
Finite Lived Intangible Assets [Line Items]        
Finite-Lived intangible asset, useful life     2 years  
Maximum [Member]        
Finite Lived Intangible Assets [Line Items]        
Finite-Lived intangible asset, useful life     12 years