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Acquisitions - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Aug. 31, 2018
Apr. 30, 2018
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
Business Acquisition [Line Items]            
Goodwill $ 749,502     $ 749,502 $ 749,502 $ 657,987
Revenue, actual       5,400 8,400  
Income (loss), actual       $ (3,900) (7,900)  
CaseloadPRO, LP            
Business Acquisition [Line Items]            
Purchase price   $ 9,200        
Payments to acquire business   $ 9,100        
Liability incurred $ 150          
Socrata, Inc.            
Business Acquisition [Line Items]            
Net cash acquired     $ 1,724      
Payments to acquire business     147,600      
Tangible assets acquired     7,500      
Liabilities assumed     8,900      
Goodwill     78,909      
Identifiable intangible assets     75,000      
Deferred tax liabilities, net     3,120      
Financial advisory and legal fees         $ 578  
Sage Data Security, LLC            
Business Acquisition [Line Items]            
Payments to acquire business     $ 11,600      
Customer Relationships | Socrata, Inc.            
Business Acquisition [Line Items]            
Weighted average useful life (in years)     14 years