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 | |||
| ||||||||||||||