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Basis of Presentation - Overview (Details) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 USD ($) restaurant country | Jul. 01, 2017 USD ($) restaurant | Dec. 30, 2017 USD ($)
Franchisor Disclosure [Line Items] |  |  |
Percentage of Revenue Collected for Advertising Fund | 3.00% |  |
Restricted Cash and Cash Equivalents, Current | $ | $ 2,518 |  | $ 2,329
Franchised Units |  |  |
Franchisor Disclosure [Line Items] |  |  |
Number of Restaurants | 1,162 | 1,035 |
Franchised Units | United States |  |  |
Franchisor Disclosure [Line Items] |  |  |
Number of Restaurants | 1,040 |  |
Franchised Units | Non-US |  |  |
Franchisor Disclosure [Line Items] |  |  |
Number of Restaurants | 122 |  |
Number of Countries in which Entity Operates | country | 9 |  |
Entity Operated Units |  |  |
Franchisor Disclosure [Line Items] |  |  |
Number of Restaurants | 26 | 21 |
Selling, General and Administrative Expenses |  |  |
Franchisor Disclosure [Line Items] |  |  |
Franchise Advertising Fund Discretionary Contributions | $ | $ 1,900 | $ 3,800 |

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