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Acquisitions - (Details) - USD ($)
$ in Thousands
Jan. 11, 2018
Jan. 10, 2018
Mar. 31, 2018
Dec. 31, 2017
Acquisitions        
Cash transaction value $ 1,053,709      
Goodwill $ 807,958   $ 4,073,511 $ 3,264,071
Cayan        
Acquisitions        
Interest acquired (as a percent) 100.00%      
Financing agreement amount $ 450,000      
Debt Instrument, Term 2 years      
Term Loan Facility dated as of January 10, 2018        
Acquisitions        
Financing agreement amount   $ 450,000    
Debt Instrument, Term   2 years