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Acquisitions - Cayan (Details) - USD ($)
$ in Thousands
Jan. 11, 2018
Sep. 30, 2018
Dec. 31, 2017
Acquisitions      
Goodwill   $ 4,113,669 $ 3,264,071
Cayan      
Acquisitions      
Interest acquired (as a percent) 100.00%    
Cash transaction value $ 1,054,931    
Goodwill 844,704    
Goodwill recognized is expected to be deductible for income tax purposes 400,000    
Term Loan Facility dated as of January 10, 2018 | Cayan      
Acquisitions      
Financing agreement amount $ 450,000    
Debt Instrument, Term 2 years