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Leases Supplemental cash flow information realted to leases (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 28, 2020
Mar. 30, 2019
Cash Flow, Operating Activities, Lessee [Abstract]    
Operating cash flows from operating leases $ (4,902) $ (3,750)
Operating cash flows from finance leases (23) (34)
Cash Flow, Financing Activities, Lessee [Abstract]    
Financing cash flows from finance leases (707) (719)
Repayments of long term capital leases   690
Lease, Cost [Abstract]    
Right-of-use asset obtained in exchange for lease obligations, operating leases $ 14,845 $ 40,311