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Acquisitions and divestitures Contingent Earn-out obligations (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Business Combination, Contingent Consideration Arrangements [Abstract]    
Contingent Earn-out Obligations, Beginning balance $ 22,386 $ 24,586
Acquisitions 3,190 5,861
Foreign currency translation (510) (5,383)
Fair value remeasurements (642) (640)
Payments or other settlements (367) (367)
Contingent Earn-out Obligations, Ending balance $ 24,057 $ 24,057