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Subsequent events (Details)
$ in Thousands
3 Months Ended
May 01, 2017
USD ($)
Clinic
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Subsequent Event [Line Items]      
Purchase price | $   $ 77,236 $ 405,154
Renal Ventures Limited L L C | Subsequent Event      
Subsequent Event [Line Items]      
Interest acquired, percentage 100.00%    
Purchase price | $ $ 360,000    
Number of businesses acquired | Clinic 38    
Number of states in which dialysis clinics acquired 6    
Number of businesses divested | Clinic 7