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Basis and Summary of Significant Accounting Policies - Debt (Details) - USD ($)
$ in Thousands
Oct. 23, 2018
Sep. 30, 2018
Dec. 31, 2017
Subsequent Event [Line Items]      
Principal balance on term loan   $ 297,340 $ 368,798
Loan facility to franchisees, maximum commitment amount   $ 85,000  
Subsequent Event      
Subsequent Event [Line Items]      
Loan facility to franchisees, maximum commitment amount $ 55,000    
Unsecured Debt | Subsequent Event | Term Loan      
Subsequent Event [Line Items]      
Line of credit, maximum borrowing capacity 225,000    
Principal balance on term loan $ 87,500