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Restaurant Closure Costs (Narrative) (Details) $ in Thousands		12 Months Ended			18 Months Ended
	Jan. 01, 2019 USD ($)	Dec. 31, 2019 property	Dec. 31, 2018 property	Dec. 31, 2017 property	Dec. 31, 2019 property
Restructuring Cost and Reserve [Line Items]
Number of closed or relocated restaurants		9	54	25
Number of restaurants closed as part of planned 2018 closures		6			56
Accounting Standards Update 2016-02 [Member] \| Restuarant Closure Costs Into Operating Lease Assets [Member]
Restructuring Cost and Reserve [Line Items]
Reclassification \| $	$ 9,144