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Revenue Recognition - Deferred Revenue Activity (Details)
$ in Thousands
9 Months Ended
Sep. 27, 2020
USD ($)
Movement in Deferred Revenue [Roll Forward]  
Balance as of December 31, 2019 $ 14,432
Increases to deferred revenue and customer deposits 93,830
Recognition of revenue (75,023)
Foreign exchange rate changes 478
Balance as of September 27, 2020 $ 33,717