Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share (Computation of Basic and Diluted Earnings Per Share)(Details)

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Earnings Per Share (Computation of Basic and Diluted Earnings Per Share)(Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 29, 2013
Sep. 23, 2012
Sep. 29, 2013
Sep. 23, 2012
NUMERATOR:        
Net income $ 2,816 $ 790 $ 8,617 $ 2,902
Less: liquidation preference and preferred return on series X preferred stock 0 86 0 577
Less: undistributed earnings allocated to participating interest 0 171 0 1,594
Net income available to common stockholders 2,816 533 8,617 731
DENOMINATOR:        
Weighted-average common shares outstanding 16,344,454 10,215,755 16,241,661 3,539,732
Basic net income per common share $ 0.17 $ 0.05 $ 0.53 $ 0.21
NUMERATOR:        
Net income 2,816 790 8,617 2,902
Less: liquidation preference and preferred return on series X preferred stock 0 86 0 577
Less: undistributed earnings allocated to participating interest 0 10 0 91
Net income available to common and participating stockholders $ 2,816 $ 694 $ 8,617 $ 2,234
DENOMINATOR:        
Weighted-average common shares outstanding 16,344,454 10,215,755 16,241,661 3,539,732
Dilutive effect of preferred stock conversion 0 3,083,397 0 7,279,884
Dilutive effect of stock options 368,164 734,082 416,924 682,254
Weighted-average of diluted shares 16,712,618 14,033,234 16,658,585 11,501,870
Diluted net income per common share $ 0.17 $ 0.05 $ 0.52 $ 0.19