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NET INCOME (LOSS) PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 01, 2018	Apr. 02, 2017
Earnings Per Share [Abstract]
Net income	$ 8,755	$ 4,674
Weighted average number of common shares used in basic net income per common share	40,443	41,637
Dilutive effect of non-vested restricted stock	251	300
Weighted average number of common shares used in diluted net income per common share	40,694	41,937
Net income per common share:
Basic (in dollars per share)	$ 0.22	$ 0.11
Diluted (in dollars per share)	$ 0.22	$ 0.11
Anti-dilutive shares	548	159

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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