Supplemental Cash Flow Information Related to Leases (Details) - USD ($)	6 Months Ended
	Jun. 26, 2020	Jun. 28, 2019
Leases [Abstract]
Operating cash flows from operating leases	$ 7,275,000	$ 7,710,000
Operating cash flows from finance leases	482,000	522,000
Financing cash flows from finance leases	$ 626,000	$ 599,000