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Acquisitions - 2020 Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Jun. 04, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]        
Goodwill $ 285,214   $ 214,513 $ 149,524
Mathway, LLC        
Business Acquisition [Line Items]        
Cash   $ 712    
Accounts receivable   1,132    
Other acquired assets   779    
Acquired intangible assets   30,320    
Total identifiable assets acquired   32,943    
Deferred revenue   (1,423)    
Liabilities assumed   (727)    
Net identifiable assets acquired   30,793    
Goodwill   70,167    
Total fair value of purchase consideration   $ 100,960