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NET INCOME PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 26, 2015	Jun. 27, 2014	Jun. 26, 2015	Jun. 27, 2014
Earnings Per Share [Abstract]
Net income	$ 17,273	$ 16,082	$ 22,989	$ 17,739
Weighted average number of common shares used in basic net income per common share	41,240	40,739	41,135	40,655
Dilutive effect of outstanding stock options and non-vested restricted stock	235	230	337	279
Weighted average number of common shares used in diluted net income per common share	41,475	40,969	41,472	40,934
Net income per common share:
Basic (in dollars per share)	$ 0.42	$ 0.39	$ 0.56	$ 0.44
Diluted (in dollars per share)	$ 0.42	$ 0.39	$ 0.55	$ 0.43
Anti-dilutive shares	106	3	189	2

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