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Leases - Supplemental Cash Flow (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 27, 2020
Jun. 29, 2019
Jun. 27, 2020
Jun. 29, 2019
Leases [Abstract]        
Operating cash flows from operating leases $ 2,860 $ 3,064 $ 5,633 $ 5,967
Operating cash flows from finance leases 6,557 3,236 12,721 6,484
Financing cash flows from finance leases 2,403 2,216 4,583 4,403
Operating leases 0 0 0 0
Finance leases $ 0 $ 3,462 $ 0 $ 4,250