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NET INCOME PER SHARE (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 27, 2014	Jun. 28, 2013	Jun. 27, 2014	Jun. 28, 2013
Earnings Per Share [Abstract]
Net income	$ 16,082	$ 12,537	$ 17,739	$ 11,462
Weighted average number of common shares used in basic net income per common share	40,739	40,140	40,655	39,962
Dilutive effect of outstanding stock options and non-vested restricted stock	230	281	279	286
Weighted average number of common shares used in diluted net income per common share	40,969	40,421	40,934	40,248
Net income per common share:
Basic (in dollars per share)	$ 0.39	$ 0.31	$ 0.44	$ 0.29
Diluted (in dollars per share)	$ 0.39	$ 0.31	$ 0.43	$ 0.28
Anti-dilutive shares	3	3	2	152

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