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Significant Accounting Policies - Noncontrolling Interest and Joint Ventures (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) restaurant entity | Apr. 01, 2018 entity | Sep. 24, 2017 USD ($) restaurant | Sep. 30, 2018 USD ($) restaurant | Sep. 24, 2017 USD ($) restaurant | Jan. 01, 2018 entity
Income Amounts Attributable to Noncontrolling Interest, Disclosures |  |  |  |  |  |
Total income before income taxes | $ (19,953) |  | $ 30,949 | $ 22,114 | $ 108,278 |
Joint ventures |  |  |  |  |  |
Noncontrolling Interests |  |  |  |  |  |
Number of Joint Ventures Having Noncontrolling Interests | entity |  |  |  |  |  | 5
Number of joint ventures divested | entity | 1 | 1 |  |  |  |
Number of Restaurants | restaurant | 183 |  | 222 | 183 | 222 |
Income Amounts Attributable to Noncontrolling Interest, Disclosures |  |  |  |  |  |
Papa John's International, Inc. | $ 1,512 |  | $ 1,469 | $ 4,384 | $ 6,172 |
Noncontrolling interests | 439 |  | 852 | 1,956 | 3,767 |
Total income before income taxes | $ 1,951 |  | $ 2,321 | $ 6,340 | $ 9,939 |

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