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Fair value measurement - Reconciliation of changes in financial liabilities measured on recurring basis (Details)
$ in Thousands
6 Months Ended
Jul. 01, 2018
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance $ 272,136
Additions 396
Payment (64,372)
Revaluations 34,618
Translation adjustment (119)
Ending balance $ 242,659