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Business Combinations, Goodwill and Intangible Assets - Purchase Price Allocation - SCIO (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Jul. 01, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Goodwill $ 350,220 $ 349,984   $ 204,481
SCIO        
Business Acquisition [Line Items]        
Cash and cash equivalents     $ 9,842  
Restricted cash     2,790  
Accounts receivable     19,924  
Other current assets     2,076  
Property and equipment     1,824  
Other assets     1,751  
Assets     111,107  
Current liabilities     (12,482)  
Deferred tax liabilities, net     (17,132)  
Other non-current liabilities     (200)  
Liabilities     (29,814)  
Net assets acquired     81,293  
Goodwill     163,751  
Total purchase consideration     245,044  
Customer relationships | SCIO        
Business Acquisition [Line Items]        
Identifiable Intangible Assets     47,800  
Developed technology | SCIO        
Business Acquisition [Line Items]        
Identifiable Intangible Assets     21,400  
Trade names and trademarks | SCIO        
Business Acquisition [Line Items]        
Identifiable Intangible Assets     $ 3,700