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 6 Months Ended
Jun. 30, 2013
Jun. 24, 2012
Jun. 30, 2013
Jun. 24, 2012
NUMERATOR:        
Net income $ 3,160 $ 1,731 $ 5,801 $ 2,111
Less: liquidation preference and preferred return on series X preferred stock 0 234 0 491
Less: undistributed earnings allocated to participating interest 0 1,466 0 1,588
Net income available to common stockholders 3,160 31 5,801 32
DENOMINATOR:        
Weighted-average common shares outstanding 16,269,243 194,766 16,190,264 201,634
Basic net income per common share $ 0.19 $ 0.16 $ 0.36 $ 0.16
NUMERATOR:        
Net income 3,160 1,731 5,801 2,111
Less: liquidation preference and preferred return on series X preferred stock 0 234 0 491
Less: undistributed earnings allocated to participating interest 0 84 0 91
Net income available to common and participating stockholders $ 3,160 $ 1,413 $ 5,801 $ 1,529
DENOMINATOR:        
Weighted-average common shares outstanding 16,269,243 194,766 16,190,264 201,634
Dilutive effect of preferred stock conversion 0 8,689,686 0 9,369,629
Dilutive effect of stock options 407,978 653,641 435,748 648,515
Weighted-average of diluted shares 16,677,221 9,538,093 16,626,012 10,219,778
Earnings Per Share, Diluted $ 0.19 $ 0.15 $ 0.35 $ 0.15