Leases Components of Lease Expense (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Components of Lease Expense [Abstract]
Operating lease cost		$ 1,275	$ 778	$ 3,874	$ 2,501
Finance Lease, Amortization of lease assets	[1]	790	751	2,370	2,249
Finance Lease, Interest on lease liabilities	[1]	446	354	1,067	1,039
Total Finance Lease Cost	[1]	$ 1,236	$ 1,105	$ 3,437	$ 3,288

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