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Business Acquisitions Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Sep. 15, 2017
Oct. 01, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]          
Goodwill     $ 51,438 $ 48,678 $ 47,396
Veri          
Business Acquisition [Line Items]          
Goodwill     2,800    
Total purchase price $ 3,500        
GigMasters.com          
Business Acquisition [Line Items]          
Current assets   $ 449      
Property and equipment   37      
Finite-lived intangible assets   3,700      
Goodwill   5,525      
Deferred revenue and other liabilities   (1,002)      
Deferred taxes, net   (831)      
Total purchase price   7,868      
Capitalized software | GigMasters.com          
Business Acquisition [Line Items]          
Finite-lived intangible assets   310      
Trade names | Veri          
Business Acquisition [Line Items]          
Finite-lived intangible assets     $ 700    
Vendor relationships | GigMasters.com          
Business Acquisition [Line Items]          
Finite-lived intangible assets   $ 2,900