Basis and Summary of Significant Accounting Policies - Accounts Receivable Net of Allowances (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable	$ 93,090	$ 98,159
Customers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable	67,359	60,879
Corporate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable	12,600	18,171
Franchisee
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable	$ 13,131	$ 19,109