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Acquisition Pro Forma Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Business Combinations [Abstract]    
Business Acquisition, Pro Forma Restaurant Sales $ 397,665 $ 764,854
Business Acquisition, Pro Forma Net Income (Loss) $ (1,260) $ (8,946)
Business Acquisition, Pro Forma Earnings Per Share, Basic and Diluted $ (0.03) $ (0.23)