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Summary of Significant Accounting Policies - Deferred Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Deferred Costs [Abstract]      
Loan costs $ 4,561 $ 4,561  
Franchise fees 4,407 3,568  
Other 21 0  
Deferred costs, gross 8,989 8,129  
Less accumulated amortization (4,343) (3,487)  
Deferred costs, net 4,646 4,642  
Schedule of Deferred Costs [Line Items]      
Amortization of deferred franchise fees 217 214 $ 197
Amortization of deferred financing fees included in interest expense 648 1,076 1,606
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 600 700 1,200
Mortgages      
Schedule of Deferred Costs [Line Items]      
Amortization of deferred financing fees included in interest expense $ 100 $ 400 $ 400