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Leases Supplemental cash flow information realted to leases (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 30, 2019
Mar. 31, 2018
Cash Flow, Operating Activities, Lessee [Abstract]    
Operating cash flows from operating leases $ (3,750)  
Operating cash flows from finance leases (34)  
Cash Flow, Financing Activities, Lessee [Abstract]    
Financing cash flows from finance leases 719 $ 510
Lease, Cost [Abstract]    
Right-of-use asset obtained in exchange for lease obligations, operating leases $ 40,311