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Fair value measurement - Reconciliation of changes in financial liabilities measured on recurring basis (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance $ 272,136
Additions 396
Payments (2) (75,252)
Revaluations 47,344
Translation adjustment (50)
Ending balance $ 244,574