Leases Components of Lease Expense (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 27, 2021	Mar. 28, 2020
Components of Lease Expense [Abstract]
Operating lease cost		$ 1,468	$ 1,292
Finance Lease, Amortization of lease assets	[1]	702	790
Finance Lease, Interest on lease liabilities	[1]	391	343
Total Finance Lease Cost	[1]	$ 1,093	$ 1,133

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