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NET INCOME PER SHARE (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 28, 2012
Sep. 30, 2011
Sep. 28, 2012
Sep. 30, 2011
Earnings Per Share [Abstract]        
Net income (in dollars) $ 14,347 $ 13,913 $ 26,214 $ 23,227
Weighted average number of common shares used in basic net income per common share 39,516,000 41,612,000 39,547,000 42,813,000
Dilutive effect of outstanding stock options and non-vested restricted stock 400,000 400,000 300,000 400,000
Weighted average number of common shares used in diluted net income per common share 39,858,000 41,958,000 39,841,000 43,176,000
Net income per common share [Abstract]        
Basic (in dollars per share) $ 0.36 $ 0.33 $ 0.66 $ 0.54
Diluted (in dollars per share) $ 0.36 $ 0.33 $ 0.66 $ 0.54
Anti-dilutive shares 700,000 1,100,000 700,000 700,000