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Acquisitions (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2018
Sep. 30, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Goodwill   $ 212,171 $ 214,489
Software Company      
Business Acquisition [Line Items]      
Purchase price of acquired assets $ 25,000    
Holdback payment 1,000    
Contingent payment $ 1,500    
Contingent payment period 36 months    
Goodwill $ 20,300    
Net tangible liabilities 300    
Technology-Based Intangible Assets | Software Company      
Business Acquisition [Line Items]      
Intangible assets 2,600    
Customer Relationships | Software Company      
Business Acquisition [Line Items]      
Intangible assets $ 2,400