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Acquisitions and divestitures Contingent Earn-out obligations (Details) - Dialysis and other businesses - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Business Acquisition [Line Items]    
Contingent Earn-out Obligations, Beginning balance $ 28,225 $ 30,248
Acquisitions 2,156 2,694
Foreign currency translation 3,055 975
Fair value remeasurements 60 (154)
Payments (5,154) (5,421)
Contingent Earn-out Obligations, Ending balance $ 28,342 $ 28,342