Basis and Summary of Significant Accounting Policies - Accounts Receivable Net of Allowances (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable	$ 85,257	$ 98,159
Customers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable	60,579	60,879
Corporate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable	12,024	18,171
Franchisee
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable	$ 12,654	$ 19,109