Business and Summary of Significant Accounting Policies - Accounts Receivable Net of Allowances (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, net of allowances	$ 104,159	$ 98,159
Customers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, net of allowances	76,819	60,879
Corporate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, net of allowances	14,109	18,171
Franchisee
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, net of allowances	$ 13,231	$ 19,109