Leases Components of Lease Expense (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Components of Lease Expense [Abstract]
Operating lease cost		$ 1,307	$ 815	$ 2,599	$ 1,723
Finance Lease, Amortization of lease assets	[1]	790	750	1,580	1,498
Finance Lease, Interest on lease liabilities	[1]	348	335	691	685
Total Finance Lease Cost	[1]	$ 1,138	$ 1,085	$ 2,271	$ 2,183

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