Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Data (Unaudited) (Quarterly Financial Data)(Details)

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Quarterly Financial Data (Unaudited) (Quarterly Financial Data)(Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 25, 2016
Sep. 25, 2016
Jun. 26, 2016
Mar. 27, 2016
Dec. 27, 2015
Sep. 27, 2015
Jun. 28, 2015
Mar. 29, 2015
Dec. 25, 2016
Dec. 27, 2015
Dec. 28, 2014
Quarterly Financial Information Disclosure [Abstract]                      
Revenue $ 79,053 $ 85,597 $ 87,909 $ 78,054 $ 70,961 $ 73,910 $ 75,362 $ 66,829 $ 330,613 $ 287,062 $ 245,101
Income from operations 2,782 [1] 6,740 8,330 6,489 (63) 6,612 7,597 4,603 24,341 18,749 15,952
Net income $ 2,333 $ 4,599 $ 5,780 $ 4,532 $ 219 $ 4,069 $ 5,373 $ 3,235 $ 17,244 $ 12,896 $ 11,491
Basic net income per common share $ 0.14 $ 0.70 $ 0.35 $ 0.27 $ 0.01 $ 0.25 $ 0.33 $ 0.20 $ 1.03 $ 0.78 $ 0.70
Diluted net income per common share $ 0.14 $ 0.27 $ 0.34 $ 0.27 $ 0.01 $ 0.24 $ 0.32 $ 0.19 $ 1.02 $ 0.77 $ 0.69
[1] (1)Contains closure costs that decreased income from operations by $0.4 million and $1.1 million and net income by $0.3 million and $1.0 million related to one restaurant in the third and fourth quarter of 2016, respectively. (2)Contains loss on asset impairment that decreased income from operations by $4.4 million and net income by $2.7 million related to three restaurants in the fourth quarter of 2015.