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Business Combination (Details) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended
Oct. 31, 2017
Sep. 30, 2018
Dec. 31, 2017
Business Acquisition [Abstract]      
Goodwill   $ 45,153 $ 45,732
RexCon Inc. [Member]      
Business Acquisition [Abstract]      
Date of acquisition   Oct. 01, 2017  
Cash purchase price $ 26,443    
Amount held in escrow 3,000    
Goodwill 3,488    
Other intangible assets $ 7,778    
RexCon Inc. [Member] | Maximum [Member]      
Business Acquisition [Abstract]      
Period of time for amount held in escrow   18 months  
RexCon Inc. [Member] | Noncompete agreements [Member]      
Business Acquisition [Abstract]      
Useful life of intangible assets   5 years  
RexCon Inc. [Member] | Technology [Member]      
Business Acquisition [Abstract]      
Useful life of intangible assets   19 years  
RexCon Inc. [Member] | Trade Names [Member]      
Business Acquisition [Abstract]      
Useful life of intangible assets   15 years  
RexCon Inc. [Member] | Customer Relationships [Member]      
Business Acquisition [Abstract]      
Useful life of intangible assets   18 years