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Summary of Significant Accounting Policies - Leases (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
lease
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
lease
Sep. 30, 2019
USD ($)
Leases        
Number of franchisees' leases recognized by the Company 0   0  
Number of sublease agreements     4  
Impairment charge - leased assets | $ $ 7,902 $ 0 $ 7,902 $ 0