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Goodwill and Intangible Assets (Summary of Preliminary Purchase Price Allocation for Acquisition) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 06, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]        
Goodwill $ 88,650   $ 92,279 $ 91,797
Machinalis S.R.L. [Member]        
Business Acquisition [Line Items]        
Cash and cash equivalents   $ 285    
Other net tangible assets   (47)    
Total net tangible assets acquired   238    
Intangible assets   638    
Goodwill   4,979    
Purchase Price   5,855    
Machinalis S.R.L. [Member] | Customer Lists [Member]        
Business Acquisition [Line Items]        
Intangible assets   100    
Machinalis S.R.L. [Member] | Trademarks [Member]        
Business Acquisition [Line Items]        
Intangible assets   299    
Machinalis S.R.L. [Member] | Non-Solicitation And Non-Compete Agreements [Member]        
Business Acquisition [Line Items]        
Intangible assets   $ 239