Leases - Other Lease Related Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows used by operating leases	$ 29,309	$ 31,482
Operating cash flows used by finance leases	463	521
Financing cash flows used by finance leases	5,389	4,575
Leased assets obtained in exchange for new operating lease liabilities	25,896	8,820
Leased assets obtained in exchange for new finance lease liabilities	$ 8,237	$ 104