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Business Acquisitions and Divestiture - Brains On-Line Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Aug. 04, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Goodwill $ 800,247   $ 787,517
Brains On-Line      
Business Acquisition [Line Items]      
Trade receivables, contractual amount   $ 1,146  
Trade receivables   1,146  
Other current assets (excluding cash)   670  
Property, plant and equipment   664  
Other long-term assets   13  
Definite-lived intangible assets   9,300  
Goodwill   12,324  
Other current liabilities   (863)  
Deferred revenue   (405)  
Long-term liabilities   (2,203)  
Total purchase price allocation   $ 20,646