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NET INCOME PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 25, 2015
Sep. 25, 2015
Jun. 26, 2015
Mar. 27, 2015
Dec. 26, 2014
Sep. 26, 2014
Jun. 27, 2014
Mar. 28, 2014
Dec. 25, 2015
Dec. 26, 2014
Dec. 27, 2013
Earnings Per Share [Abstract]                      
Net income $ 28,168 $ 20,090 $ 17,273 $ 5,716 $ 27,027 $ 20,910 $ 16,082 $ 1,656 $ 71,247 $ 65,675 $ 44,924
Weighted average number of common shares used in basic net income per common share                 41,226 40,734 40,166
Dilutive effect of outstanding stock options and non-vested restricted stock                 396 442 336
Weighted average number of common shares used in diluted net income per common share                 41,622 41,176 40,502
Net income per common share:                      
Basic (in dollars per share) $ 0.68 $ 0.49 $ 0.42 $ 0.14 $ 0.67 $ 0.51 $ 0.39 $ 0.04 $ 1.73 $ 1.61 $ 1.12
Diluted (in dollars per share) $ 0.67 $ 0.48 $ 0.42 $ 0.14 $ 0.65 $ 0.51 $ 0.39 $ 0.04 $ 1.71 $ 1.59 $ 1.11
Anti-dilutive shares                 89 58 78