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Leases (Supplemental Cash Flow Information) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 28, 2021
Mar. 29, 2020
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows relating to operating leases $ 2,109 $ 3,074
Lease liabilities arising from obtaining right-of-use assets:    
Operating leases $ 394 $ 1,295