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Quarterly Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
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.