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Summary of Significant Accounting Policies - Deferred Costs and Mortgage Debt (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Schedule of Deferred Costs [Line Items]      
Loan costs $ 5,174 $ 4,455  
Franchise fees 4,619 4,311  
Other 19 75  
Deferred costs, gross 9,812 8,841  
Less accumulated amortization (5,185) (3,457)  
Deferred costs, net 4,627 5,384  
Amortization of deferred franchise fees 248 244 $ 247
Amortization of deferred financing fees included in interest expense 1,825 1,275 912
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 1,500 900 500
Mortgages      
Schedule of Deferred Costs [Line Items]      
Amortization of deferred financing fees included in interest expense $ 300 $ 400 $ 400