Leases - Supplemental cash flow information (Details) $ in Thousands	6 Months Ended
	Jun. 29, 2019 USD ($)
Cash Flow, Lessee [Abstract]
Operating cash flows from operating leases	$ 63,910
Operating cash flows from finance leases	26
Financing cash flows from finance leases	732
Right-of-use assets obtained in exchange for lease obligations:
Operating Leases	90,091
Finance Leases	195
Amortization of right of use operating lease assets	$ 56,950