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NET INCOME (LOSS) PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2018	Jul. 02, 2017	Jul. 01, 2018	Jul. 02, 2017
Earnings Per Share [Abstract]
Net income	$ 17,732	$ 13,134	$ 26,487	$ 17,808
Weighted average number of common shares used in basic net income per common share	40,227	41,579	40,335	41,608
Dilutive effect of non-vested restricted stock	242	277	241	267
Weighted average number of common shares used in diluted net income per common share	40,469	41,856	40,576	41,875
Net income per common share:
Basic (in dollars per share)	$ 0.44	$ 0.32	$ 0.66	$ 0.43
Diluted (in dollars per share)	$ 0.44	$ 0.31	$ 0.65	$ 0.43
Anti-dilutive shares	254	60	218	183

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