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Earnings Per Share (Tables)
3 Months Ended
Mar. 29, 2013
EARNINGS PER SHARE (EPS) [Abstract]  
Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block]
 The following table illustrates the calculation of Basic and Diluted EPS (in thousands, except per share amounts):
    Three Months Ended 
    March 29, March 30, 
    2013 2012 
 Numerator for basic and diluted EPS: 
  Net income $ 5,663 $ 4,467 
          
 Denominator for basic EPS:    
  Weighted average shares outstanding  23,750   23,420 
 Effect of dilutive securities:    
  Stock options, restricted stock and restricted stock units  665   428 
 Denominator for diluted EPS  24,415   23,848 
 Basic EPS$0.24 $0.19 
 Diluted EPS$0.23 $0.19 
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
 The diluted weighted average share calculations do not include the following securities, which are not dilutive to the EPS calculations or the performance criteria have not been met:
        
    Three Months Ended 
    March 29, March 30, 
    2013 2012 
 Time-vested stock options, restricted     
  stock and restricted stock units532,000 1,209,000 
 Performance-vested stock options     
  and restricted stock units595,000 552,000