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Summary of Significant Accounting Policies - Deferred Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deferred Costs [Abstract]      
Loan costs $ 2,057 $ 4,561  
Franchise fees 4,471 4,407  
Other 133 21  
Deferred costs, gross 6,661 8,989  
Less accumulated amortization (1,591) (4,343)  
Deferred costs, net 5,070 4,646  
Schedule of Deferred Costs [Line Items]      
Amortization of deferred franchise fees 237 217 $ 214
Amortization of deferred financing fees included in interest expense 902 648 1,076
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 900 600 700
Mortgages      
Schedule of Deferred Costs [Line Items]      
Amortization of deferred financing fees included in interest expense $ 400 $ 100 $ 400