Basis and Summary of Significant Accounting Policies - Accounts Receivable Net of Allowances (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable	$ 81,433	$ 99,887
Customers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable	43,797	48,661
Corporate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable	11,893	23,431
Franchisee
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable	$ 25,743	$ 27,795