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Quarterly Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 28, 2016 | Sep. 28, 2016 | Jun. 29, 2016 | Mar. 30, 2016 | Dec. 30, 2015 | Sep. 30, 2015 | Jul. 01, 2015 | Apr. 01, 2015 | Dec. 28, 2016 | Dec. 30, 2015 | Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company restaurant sales | $ 94,592 |  | $ 93,122 |  | $ 89,210 |  | $ 90,386 |  | $ 89,183 |  | $ 89,279 |  | $ 88,629 |  | $ 85,982 |  | $ 367,310 | $ 353,073 | $ 334,684
Franchise and licensing revenue | 35,013 |  | 35,264 |  | 35,105 |  | 34,256 |  | 34,842 |  | 34,499 |  | 34,690 |  | 34,189 |  | 139,638 | 138,220 | 137,611
Total operating revenue | 129,605 |  | 128,386 |  | 124,315 |  | 124,642 |  | 124,025 |  | 123,778 |  | 123,319 |  | 120,171 |  | 506,948 | 491,293 | 472,295
Total operating costs and expenses | 113,583 |  | 110,809 |  | 129,148 |  | 106,409 |  | 109,328 |  | 108,055 |  | 105,905 |  | 104,854 |  | 459,949 | 428,142 | 414,964
Operating income | 16,022 |  | 17,577 |  | (4,833) |  | 18,233 |  | 14,697 |  | 15,723 |  | 17,414 |  | 15,317 |  | 46,999 | 63,151 | 57,331
Net income | $ 11,274 |  | $ 9,726 |  | $ (11,552) |  | $ 9,954 |  | $ 8,759 |  | $ 8,950 |  | $ 9,734 |  | $ 8,533 |  | $ 19,402 | $ 35,976 | $ 32,725
Basic net income per share | $ 0.16 | [1] | $ 0.13 | [1] | $ (0.15) | [1] | $ 0.13 | [1] | $ 0.11 | [2] | $ 0.11 | [2] | $ 0.12 | [2] | $ 0.10 | [2] | $ 0.26 | $ 0.44 | $ 0.38
Diluted net income per share | $ 0.15 | [1] | $ 0.13 | [1] | $ (0.15) | [1] | $ 0.13 | [1] | $ 0.11 | [2] | $ 0.11 | [2] | $ 0.11 | [2] | $ 0.10 | [2] | $ 0.25 | $ 0.42 | $ 0.37
[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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