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Leases - Components of Lease Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 28, 2020
Mar. 30, 2019
Leases [Abstract]    
Operating lease expense $ 1,924 $ 1,745
Short-term lease expense 40 17
Variable lease expense 383 419
Lease, Cost $ 2,347 $ 2,181