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Acquisitions and Divestitures - Assets Acquired and Liabilities Assumed and Recognized at Acquisition Dates at Estimated Fair Values (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Goodwill $ 6,841,960 $ 6,610,279 $ 6,015,375
Renal Ventures Limited, LLC      
Business Acquisition [Line Items]      
Current assets, net of cash acquired 22,739    
Property and equipment 36,295    
Amortizable intangible and other long-term assets 11,547    
Goodwill 298,200    
Current liabilities (8,389)    
Long-term liabilities (479)    
Aggregate purchase price $ 359,913