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. 27, 2015
Sep. 27, 2015
Jun. 28, 2015
Mar. 29, 2015
Dec. 28, 2014
Sep. 28, 2014
Jun. 29, 2014
Mar. 30, 2014
Dec. 27, 2015
Dec. 28, 2014
Dec. 29, 2013
Quarterly Financial Information Disclosure [Abstract]                      
Revenue $ 70,961 $ 73,910 $ 75,362 $ 66,829 $ 61,759 $ 64,107 $ 63,284 $ 55,951 $ 287,062 $ 245,101 $ 204,361
Income from operations (63) [1] 6,612 7,597 4,603 2,985 4,252 4,933 3,782 18,749 15,952 15,374
Net income $ 219 $ 4,069 $ 5,373 $ 3,235 $ 2,307 $ 3,106 $ 3,446 $ 2,632 $ 12,896 $ 11,491 $ 11,069
Basic net income per common share $ 0.01 $ 0.25 $ 0.33 $ 0.20 $ 0.14 $ 0.19 $ 0.21 $ 0.16 $ 0.78 $ 0.70 $ 0.68
Diluted net income per common share $ 0.01 $ 0.24 $ 0.32 $ 0.19 $ 0.14 $ 0.19 $ 0.21 $ 0.16 $ 0.77 $ 0.69 $ 0.66
[1] (1)Contains loss on asset impairment that decreased income from operations by $4.4 million related to three restaurants in the fourth quarter of 2015.