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NET INCOME PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 25, 2015
Sep. 26, 2014
Sep. 25, 2015
Sep. 26, 2014
Earnings Per Share [Abstract]        
Net income $ 20,090 $ 20,910 $ 43,079 $ 38,650
Weighted average number of common shares used in basic net income per common share 41,296 40,793 41,189 40,701
Dilutive effect of outstanding stock options and non-vested restricted stock 324 245 357 270
Weighted average number of common shares used in diluted net income per common share 41,620 41,038 41,546 40,971
Net income per common share:        
Basic (in dollars per share) $ 0.49 $ 0.51 $ 1.05 $ 0.95
Diluted (in dollars per share) $ 0.48 $ 0.51 $ 1.04 $ 0.94
Anti-dilutive shares 91 97 227 35