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Acquisitions - Assets and Liabilities Acquired (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Feb. 28, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Goodwill $ 834,572   $ 753,718
MicroPact      
Business Acquisition [Line Items]      
Cash   $ 1,983  
Accounts receivable   11,852  
Other current assets   8,979  
Other noncurrent assets   10,417  
Identifiable intangible assets   118,843  
Goodwill   82,029  
Accounts payable   (602)  
Accrued expenses   (2,432)  
Other noncurrent liabilities   (8,879)  
Deferred revenue   (9,898)  
Deferred tax liabilities, net   (6,144)  
Total consideration   $ 206,148