Leases Supplemental Cash Flow and Non-cash Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018
Cash Flow, Operating Activities, Lessee
Operating cash flows from finance leases	$ 19,567
Operating cash flows from operating leases	46,425
Cash Flow, Financing Activities, Lessee
Financing cash flows from finance leases	3,521	$ 2,784
Lessee, Lease, Description
Right-of-use assets obtained in exchange for finance lease liabilities	23,534	$ 1,904
Right-of-use asset obtained in exchange for operating lease liabilities	$ 5,677