Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019
Leases
Operating cash flows from finance leases	$ 295
Financing cash flows from finance leases	939
Operating cash flows from operating leases	18,744	$ 20,307
Right-of-use assets obtained in exchange for new finance lease liabilities	19
Right-of-use assets obtained in exchange for new operating lease liabilities	13,370	6,180
Cash received from sublease income	$ 5,014	$ 4,662