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Leases Supplemental cash flow information realted to leases (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 27, 2020
Jun. 29, 2019
Cash Flow, Operating Activities, Lessee [Abstract]    
Operating cash flows from operating leases $ (10,313) $ (8,175)
Operating cash flows from finance leases (58) (63)
Cash Flow, Financing Activities, Lessee [Abstract]    
Financing cash flows from finance leases (1,062) (860)
Lease, Cost [Abstract]    
Right-of-use asset obtained in exchange for lease obligations, operating leases 24,024 47,779
Right-of-use asset obtained in exchange for lease obligations, finance leases $ 4,268 $ 0