Leases - Other Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 24, 2020	Sep. 26, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Financing cash flows from finance leases	$ 1,389	$ 1,908
Operating cash flows from finance leases	794
Operating cash flows from operating leases	11,376
Right of use assets obtained in exchange for new lease obligations:
Finance lease liabilities	1,364
Operating lease liabilities	$ 9,644