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Quarterly Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 27, 2017 | Sep. 27, 2017 | Jun. 28, 2017 | Mar. 29, 2017 | Dec. 28, 2016 | Sep. 28, 2016 | Jun. 29, 2016 | Mar. 30, 2016 | Dec. 27, 2017 | Dec. 28, 2016 | Dec. 30, 2015
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company restaurant sales | $ 100,303 |  | $ 97,915 |  | $ 98,355 |  | $ 93,779 |  | $ 94,592 |  | $ 93,122 |  | $ 89,210 |  | $ 90,386 |  | $ 390,352 | $ 367,310 | $ 353,073
Franchise and licensing revenue | 35,196 |  | 34,469 |  | 35,021 |  | 34,131 |  | 35,013 |  | 35,264 |  | 35,105 |  | 34,256 |  | 138,817 | 139,638 | 138,220
Total operating revenue | 135,499 |  | 132,384 |  | 133,376 |  | 127,910 |  | 129,605 |  | 128,386 |  | 124,315 |  | 124,642 |  | 529,169 | 506,948 | 491,293
Total operating costs and expenses | 116,646 |  | 113,849 |  | 116,367 |  | 111,609 |  | 113,583 |  | 110,809 |  | 129,148 |  | 106,409 |  | 458,471 | 459,949 | 428,142
Operating income | 18,853 |  | 18,535 |  | 17,009 |  | 16,301 |  | 16,022 |  | 17,577 |  | (4,833) |  | 18,233 |  | 70,698 | 46,999 | 63,151
Net income | $ 13,147 |  | $ 9,325 |  | $ 8,749 |  | $ 8,373 |  | $ 11,274 |  | $ 9,726 |  | $ (11,552) |  | $ 9,954 |  | $ 39,594 | $ 19,402 | $ 35,976
Basic net income per share | $ 0.20 | [1] | $ 0.14 | [1] | $ 0.13 | [1] | $ 0.12 | [1] | $ 0.16 | [2] | $ 0.13 | [2] | $ (0.15) | [2] | $ 0.13 | [2] | $ 0.58 | $ 0.26 | $ 0.44
Diluted net income per share | $ 0.19 | [1] | $ 0.13 | [1] | $ 0.12 | [1] | $ 0.11 | [1] | $ 0.15 | [2] | $ 0.13 | [2] | $ (0.15) | [2] | $ 0.13 | [2] | $ 0.56 | $ 0.25 | $ 0.42
[1] | Per share amounts do not necessarily sum to the total year amounts due to changes in shares outstanding and rounding
[2] | Per share amounts do not necessarily sum to the total year amounts due to changes in shares outstanding and rounding.

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