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Business Acquisitions and Divestiture - Brains On-Line Additional Information (Details) - Brains On-Line
$ in Thousands, € in Millions
3 Months Ended 9 Months Ended
Aug. 04, 2017
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
Aug. 04, 2017
EUR (€)
Aug. 04, 2017
USD ($)
Business Acquisition [Line Items]          
Purchase price $ 21,300        
Undiscounted contingent payments       € 6.7 $ 7,900
Purchase price allocation         $ 20,646
Cash acquired $ 700        
Integration related costs and transaction costs   $ 1,200 $ 2,100