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Quarterly Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 30, 2015
Sep. 30, 2015
Jul. 01, 2015
Apr. 01, 2015
Dec. 31, 2014
Sep. 24, 2014
Jun. 25, 2014
Mar. 26, 2014
Dec. 30, 2015
Dec. 31, 2014
Dec. 25, 2013
Quarterly Financial Information Disclosure [Abstract]                      
Company restaurant sales $ 89,183 $ 89,279 $ 88,629 $ 85,982 $ 91,415 $ 82,827 $ 81,138 $ 79,304 $ 353,073 $ 334,684 $ 328,334
Franchise and licensing revenue 34,842 34,499 34,690 34,189 37,314 34,205 33,476 32,616 138,220 137,611 134,259
Total operating revenue 124,025 123,778 123,319 120,171 128,729 117,032 114,614 111,920 491,293 472,295 462,593
Total operating costs and expenses 109,328 108,055 105,905 104,854 112,324 102,323 99,669 100,648 428,142 414,964 415,072
Operating income 14,697 15,723 17,414 15,317 16,405 14,709 14,945 11,272 63,151 57,331 47,521
Net income $ 8,759 $ 8,950 $ 9,734 $ 8,533 $ 9,678 $ 8,343 $ 8,273 $ 6,431 $ 35,976 $ 32,725 $ 24,572
Basic net income per share $ 0.11 [1] $ 0.11 [1] $ 0.12 [1] $ 0.10 [1] $ 0.11 [2] $ 0.10 [2] $ 0.10 [2] $ 0.07 [2] $ 0.44 $ 0.38 $ 0.27
Diluted net income per share $ 0.11 [1] $ 0.11 [1] $ 0.11 [1] $ 0.10 [1] $ 0.11 [2] $ 0.10 [2] $ 0.09 [2] $ 0.07 [2] $ 0.42 $ 0.37 $ 0.26
[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.