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Leases Supplemental Cash Flow Information Related To Leases (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 27, 2020
Sep. 29, 2019
Sep. 27, 2020
Sep. 29, 2019
Leases [Abstract]        
Operating cash flows from operating leases $ 3,891 $ 3,528 $ 11,352 $ 10,770
Operating cash flows from finance leases 4 6 13 20
Financing cash flows from finance leases $ 43 $ 64 $ 130 $ 210