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Summary of Significant Accounting Policies - Deferred Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Deferred Costs [Abstract]      
Loan costs $ 4,561 $ 4,511  
Franchise fees 3,568 3,474  
Deferred costs, gross 8,129 7,985  
Less accumulated amortization (3,487) (2,620)  
Deferred costs, net 4,642 5,365  
Schedule of Deferred Costs [Line Items]      
Amortization of deferred franchise fees 214 197 $ 131
Amortization of deferred financing fees included in interest expense 1,076 1,606 1,532
Franchise      
Schedule of Deferred Costs [Line Items]      
Amortization of deferred franchise fees 200 200 100
Loans      
Schedule of Deferred Costs [Line Items]      
Amortization of deferred financing fees included in interest expense 700 1,200 1,200
Mortgages      
Schedule of Deferred Costs [Line Items]      
Amortization of deferred financing fees included in interest expense $ 400 $ 400 $ 400