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Basic and Diluted Income Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 29, 2013
Mar. 30, 2012
Numerator:    
Net income $ 471 $ 232
Weighted average common shares and denominator for basic calculation:    
Weighted average common shares outstanding 36,660 36,237
Less: Unvested restricted stock (233) (166)
Denominator for basic calculation 36,427 36,071
Weighted average effects of dilutive equity-based compensation awards:    
Stock options 522 1,442
Warrants 400 907
Restricted stock 69 0
Denominator for diluted calculation 37,418 38,420
Net income per share - basic (in dollars per share) $ 0.01 $ 0.01
Net income per share - diluted (in dollars per share) $ 0.01 $ 0.01