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Quarterly Financial Information (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 27, 2013
Sep. 27, 2013
Jun. 28, 2013
Mar. 29, 2013
Dec. 28, 2012
Sep. 28, 2012
Jun. 29, 2012
Mar. 30, 2012
Dec. 27, 2013
Dec. 28, 2012
Dec. 30, 2011
Quarterly Financial Information [Abstract]                      
Total revenue $ 52,604 $ 57,916 $ 58,961 $ 54,349 $ 55,042 $ 55,647 $ 57,964 $ 54,083 $ 223,830 $ 222,736 $ 209,063
Operating income 2,396 4,717 5,085 3,529 4,053 4,538 4,483 3,977 15,727 17,051 16,899
Income (loss) from continuing operations 1,206 2,699 2,930 2,029 6,637 2,593 3,838 3,851 8,864 16,919 21,427
(Loss) income from discontinued operations   (64)   (71) 46 43 7 (318) (135) (222) 342
Net income 1,206 2,635 2,930 1,958 6,683 [1] 2,636 [1] 3,845 [1] 3,533 [1] 8,729 16,697 21,769
Basic net income (loss) per common share:                      
Income (loss) per common share from continuing operations $ 0.04 $ 0.09 $ 0.10 $ 0.06 $ 0.23 $ 0.09 $ 0.13 $ 0.10 $ 0.29 $ 0.54 $ 0.54
(Loss) income per common share from discontinued operations               $ (0.01)   $ (0.01) $ 0.01
Net income per common share $ 0.04 $ 0.09 $ 0.10 $ 0.06 $ 0.23 $ 0.09 $ 0.13 $ 0.09 $ 0.29 $ 0.53 $ 0.55
Diluted net income (loss) per common share:                      
Income (loss) per common share from continuing operations $ 0.04 $ 0.08 $ 0.09 $ 0.07 $ 0.21 $ 0.08 $ 0.12 $ 0.10 $ 0.28 $ 0.51 $ 0.51
(Loss) income per common share from discontinued operations       $ (0.01)       $ (0.01) $ (0.01) $ (0.01) $ 0.01
Net income per common share $ 0.04 $ 0.08 $ 0.09 $ 0.06 $ 0.21 $ 0.08 $ 0.12 $ 0.09 $ 0.27 $ 0.50 $ 0.52
Release of deferred income tax valuation allowance         $ 6,700       $ 5,705 $ (1,191) $ (5,257)
[1] The quarter ended December 28, 2012 included the benefit of the release of $6.7 million of deferred income tax asset valuation allowance. Quarterly basic and diluted net income per common share were computed independently for each quarter and do not necessarily total to the year to date basic and diluted net income per common share.