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NET INCOME PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2013	Sep. 28, 2012	Sep. 27, 2013	Sep. 28, 2012
Earnings Per Share [Abstract]
Net income	$ 18,952	$ 14,347	$ 30,412	$ 26,214
Weighted average number of common shares used in basic net income per common share	40,330,000	39,516,000	40,085,000	39,547,000
Dilutive effect of outstanding stock options and non-vested restricted stock	400,000	400,000	300,000	300,000
Weighted average number of common shares used in diluted net income per common share	40,670,000	39,858,000	40,395,000	39,841,000
Net income per common share:
Basic (in dollars per share)	$ 0.47	$ 0.36	$ 0.76	$ 0.66
Diluted (in dollars per share)	$ 0.47	$ 0.36	$ 0.75	$ 0.66
Anti-dilutive shares	0	700,000	100,000	700,000

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