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System Optimization Gains, Net Summary of Disposition Activity (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 27, 2020 USD ($) number_of_restaurants | Sep. 29, 2019 USD ($) | Sep. 27, 2020 USD ($) number_of_restaurants | Sep. 29, 2019 USD ($) number_of_restaurants | Dec. 29, 2019 number_of_restaurants | Jan. 01, 2017
System optimization gains, net |  |  |  |  |  |
Company-operated restaurant ownership percentage |  |  |  |  |  | 5.00%
Number of restaurants classified as assets held for sale | number_of_restaurants | 43 |  | 43 |  | 0 |
System optimization gains, net | $ 23 | $ 1,040 | $ 2,333 | $ 1,162 |  |
Proceeds from sales |  |  | $ 3,570 | $ 2,038 |  |
Sale of franchise-operated restaurant to franchisee |  |  |  |  |  |
System optimization gains, net |  |  |  |  |  |
Significant Changes, Franchises Sold | number_of_restaurants |  |  | 22 | 3 |  |
Sale of Company-operated restaurants to franchisees |  |  |  |  |  |
System optimization gains, net |  |  |  |  |  |
Post closing adjustments on sales of restaurants | 23 | 1,033 | $ 368 | $ 1,087 |  |
Recognition of deferred gain on sale of property |  | 911 |  | 911 |  |
Sale of other assets |  |  |  |  |  |
System optimization gains, net |  |  |  |  |  |
System optimization gains, net | $ 0 | 7 | 1,965 | 75 |  |
Proceeds from sales |  | $ 798 | $ 3,570 | $ 2,038 |  |

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