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Restaurant Closure Costs and Impairment of Long-Lived Assets (Schedule of Reconciliation of the Impairment Liability) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Restaurant Closure Costs and Impairment of Long-Lived Assets [Abstract]  
Lease termination costs for closed restaurants, beginning balance $ 1,416
Charges 13,843
Payments (4,519)
Lease termination costs for closed restaurants, ending balance $ 10,740