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Fair value measurement - Reconciliation of changes in financial liabilities measured on recurring basis (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance $ 304,248
Payments (138,020)
Revaluations 25,456
Translation adjustment (13)
Ending balance $ 191,671