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Leases - Components of Lease Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 27, 2021
Mar. 28, 2020
Leases [Abstract]    
Operating lease expense $ 2,123 $ 1,924
Short-term lease expense 37 40
Variable lease expense 537 383
Total lease expense $ 2,697 $ 2,347