Leases Supplemental Lease Information (Details) - USD ($) $ in Thousands		6 Months Ended
		Jun. 26, 2021	Jun. 27, 2020
Supplemental Lease Information [Abstract]
Operating Lease, Weighted Average Remaining Lease Term		7 years 5 months 19 days	8 years 7 days
Finance Lease, Weighted Average Remaining Lease Term	[1]	13 years 10 days	11 years 6 months 10 days
Operating Lease, Weighted Average Discount Rate, Percent		6.92%	6.93%
Finance Lease, Weighted Average Discount Rate, Percent	[1]	9.56%	9.19%
Operating Lease, Payments		$ 2,438	$ 2,330
Interest paid for financing leases	[1]	770	691
Finance Lease, Principal Payments	[1]	$ 1,480	$ 1,747

[1] Includes leases classified as failed sale-leaseback transactions.