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Acquisitions - Cayan (Details) - USD ($)
$ in Thousands
Jan. 11, 2018
Jun. 30, 2018
Dec. 31, 2017
Acquisitions      
Goodwill   $ 4,088,579 $ 3,264,071
Cayan      
Acquisitions      
Interest acquired (as a percent) 100.00%    
Goodwill $ 819,678 $ 11,700  
Term Loan Facility dated as of January 10, 2018 | Cayan      
Acquisitions      
Financing agreement amount $ 450,000    
Debt Instrument, Term 2 years