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Acquisitions - Assets and Liabilities Acquired (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Feb. 28, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Goodwill $ 840,117   $ 753,718 $ 657,987
MicroPact        
Business Acquisition [Line Items]        
Cash   $ 1,983    
Accounts receivable   10,535    
Other current assets   8,979    
Other noncurrent assets   10,417    
Identifiable intangible assets   136,143    
Goodwill   76,319    
Accounts payable   (602)    
Accrued expenses   (4,092)    
Other noncurrent liabilities   (8,879)    
Deferred revenue   (13,510)    
Deferred tax liabilities, net   (13,125)    
Total consideration   $ 204,168