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NET INCOME (LOSS) PER SHARE (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 28, 2013
Jun. 29, 2012
Jun. 28, 2013
Jun. 29, 2012
Earnings Per Share [Abstract]        
Net income $ 12,537 $ 10,337 $ 11,462 $ 11,867
Weighted average number of common shares used in basic net income per common share 40,140,000 39,701,000 39,962,000 39,563,000
Dilutive effect of outstanding stock options and non-vested restricted stock 300,000 400,000 200,000 400,000
Weighted average number of common shares used in diluted net income per common share 40,421,000 40,097,000 40,248,000 39,993,000
Net income per common share:        
Basic (in dollars per share) $ 0.31 $ 0.26 $ 0.29 $ 0.30
Diluted (in dollars per share) $ 0.31 $ 0.26 $ 0.28 $ 0.30
Anti-dilutive shares 0 700,000 200,000 800,000