Leases - Cash and Supplemental Noncash (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 25, 2019	Sep. 25, 2019
Leases [Abstract]
Operating cash flows from finance leases	$ 906	$ 3,740
Operating cash flows from operating leases	6,816	19,569
Financing cash flows from finance leases	497	2,044
Right-of-use assets obtained in exchange for new finance lease liabilities	0	305
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 31,050	$ 58,581