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NET INCOME PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 25, 2016
Mar. 27, 2015
Earnings Per Share [Abstract]    
Net income $ 6,968 $ 5,716
Weighted average number of common shares used in basic net income per common share 41,502 41,031
Dilutive effect of outstanding stock options and non-vested restricted stock 296 331
Weighted average number of common shares used in diluted net income per common share 41,798 41,362
Net income per common share:    
Basic (in dollars per share) $ 0.17 $ 0.14
Diluted (in dollars per share) $ 0.17 $ 0.14
Anti-dilutive shares 284 266