Other Expense (Income) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2020 USD ($) restaurant transaction	Jun. 30, 2019 USD ($)	Jun. 28, 2020 USD ($) restaurant transaction	Jun. 30, 2019 USD ($) restaurant transaction
Other Income and Expenses [Abstract]
Other Income	$ 2,003		$ 1,947	$ 1,753
Litigation Settlement, Amount Awarded from Other Party				$ 1,900
Number Of Restaurants Subject To Insurance Recovery | restaurant	4		4	1
Gain (loss) on sale-leaseback transactions	$ (800)	$ 100	$ 567	$ 105
Property, Plant and Equipment, Disposals	100	500	200	500
Other Expenses		$ 400
Gain on Business Interruption Insurance Recovery	$ 1,300		$ 1,600	$ 100
Number Of Sale-leaseback Transactions In Gain Position | transaction	3		10	2