Basis and Summary of Significant Accounting Policies - Accounts Receivable Net of Allowances (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable	$ 79,933	$ 104,159
Customers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable	57,134	76,819
Corporate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable	12,141	14,109
Franchisee
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable	$ 10,658	$ 13,231