Leases - Supplemental cash flow information (Details) $ in Thousands	9 Months Ended
	Sep. 28, 2019 USD ($)
Cash paid for amounts included in measurement of lease liabilities:
Operating cash flows from operating leases	$ 96,752
Operating cash flows from finance leases	123
Financing cash flows from finance leases	1,224
Right-of-use assets obtained in exchange for lease obligations:
Operating Leases	113,253
Finance Leases	7,636
Amortization of right of use operating lease assets	$ 85,061