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Summary of Significant Accounting Policies - Deferred Costs and Mortgage Debt (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of Deferred Costs [Line Items]      
Loan costs $ 4,455 $ 2,104  
Franchise fees 4,311 4,409  
Other 75 129  
Deferred costs, gross 8,841 6,642  
Less accumulated amortization (3,457) (2,371)  
Deferred costs, net 5,384 4,271  
Amortization of deferred franchise fees 244 247 $ 237
Amortization of deferred financing fees included in interest expense 1,275 912 902
Franchise      
Schedule of Deferred Costs [Line Items]      
Amortization of deferred franchise fees 200 200 200
Loans      
Schedule of Deferred Costs [Line Items]      
Amortization of deferred financing fees included in interest expense 900 500 500
Mortgages      
Schedule of Deferred Costs [Line Items]      
Amortization of deferred financing fees included in interest expense $ 400 $ 400 $ 400