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Acquisitions - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Feb. 06, 2020
Dec. 31, 2019
Oct. 04, 2019
Business Acquisition [Line Items]              
Goodwill $ 383,336   $ 383,336     $ 346,134  
Transaction costs, excluding integration and transformation costs 0 $ 2,200 3,500 $ 6,200      
Localytics              
Business Acquisition [Line Items]              
Revenues     11,800        
Goodwill         $ 39,919    
Altify              
Business Acquisition [Line Items]              
Deferred tax liabilities     1,000        
Goodwill             $ 34,426
All acquisitions              
Business Acquisition [Line Items]              
Goodwill $ 154,300   $ 154,300        
Goodwill deductible for tax purposes           $ 6,200