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Fair value measurement - Reconciliation of changes in financial liabilities measured on recurring basis (Details)
$ in Thousands
9 Months Ended
Sep. 29, 2019
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance $ 304,248
Payments (138,098)
Revaluations 40,894
Translation adjustment (164)
Ending balance $ 206,880