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Acquisitions and divestitures Contingent Earn-out obligations (Details) - Dialysis and other businesses - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Business Acquisition [Line Items]    
Contingent Earn-out Obligations, Beginning balance $ 28,342 $ 30,248
Acquisitions 487 3,181
Foreign currency translation (1,954) (979)
Fair value remeasurements (1,166) (1,320)
Payments (2,952) (8,373)
Contingent Earn-out Obligations, Ending balance $ 22,757 $ 22,757