Other Expense (Income) (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 27, 2020 USD ($) transaction	Sep. 27, 2020 USD ($) restaurant transaction	Sep. 29, 2019 USD ($) transaction restaurant
Other Income and Expenses [Abstract]
Other Income	$ (515)	$ 1,432	$ 1,773
Litigation Settlement, Amount Awarded from Other Party			$ 1,900
Number Of Restaurants Subject To Insurance Recovery | restaurant		4	1
Gain on sale-leaseback transactions	400	$ 226	$ 289
Property, Plant and Equipment, Disposals	300	500	600
Gain on Business Interruption Insurance Recovery	$ 200	$ 1,700	$ 100
Number Of Sale-leaseback Transactions In Gain Position | transaction	1	11	3