Cash and Supplemental Noncash (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 26, 2019	Jun. 26, 2019
Leases Cash and Supplemental Noncash [Abstract]
Operating cash flows from finance leases	$ 1,318	$ 2,834
Operating cash flows from operating leases	6,441	12,752
Financing cash flows from finance leases	752	1,547
Right-of-use assets obtained in exchange for new finance lease liabilities	305	305
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 22,481	$ 27,531