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Business Summary and Basis of Presentation - Narrative (Details)
6 Months Ended
Jun. 30, 2020
segment
restaurant
state
Franchisor Disclosure [Line Items]  
Number of states with operations | state 29
Number of operating segments | segment 1
Number of reportable segments | segment 1
Company-Owned  
Franchisor Disclosure [Line Items]  
Number of restaurants | restaurant 380
Franchise  
Franchisor Disclosure [Line Items]  
Number of restaurants | restaurant 76