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 |