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Leases Supplemental cash flow information realted to leases (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 26, 2020
Sep. 28, 2019
Cash Flow, Operating Activities, Lessee [Abstract]    
Operating cash flows from operating leases $ (15,222) $ (12,524)
Operating cash flows from finance leases (103) (91)
Cash Flow, Financing Activities, Lessee [Abstract]    
Financing cash flows from finance leases (1,525) (1,061)
Lease, Cost [Abstract]    
Right-of-use asset obtained in exchange for lease obligations, operating leases 28,246 52,889
Right-of-use asset obtained in exchange for lease obligations, finance leases $ 7,339 $ 0