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Acquisitions - Additional Information (Details) - USD ($)
$ in Thousands
Mar. 22, 2019
Mar. 31, 2019
Dec. 31, 2018
Mar. 22, 2018
Business Acquisition [Line Items]        
Goodwill   $ 8,142,473 $ 2,396,544  
Annax        
Business Acquisition [Line Items]        
Purchase price, net of cash acquired       $ 28,667
Goodwill       27,188
Escrow deposits   $ 13,200    
Goodwill and other intangible assets acquired       38,900
Acquired indefinite-lived intangible assets       11,715
Annax | Customer relationships        
Business Acquisition [Line Items]        
Acquired indefinite-lived intangible assets       7,500
Intangible assets, weighted average useful life (years) 20 years      
Annax | Trade Names        
Business Acquisition [Line Items]        
Acquired indefinite-lived intangible assets       $ 3,800