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NET INCOME (LOSS) PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Earnings Per Share [Abstract]
Net income	$ 24,380	$ 21,221	$ 50,867	$ 39,029
Weighted average number of common shares used in basic net income per common share	39,743	41,046	40,138	41,420
Dilutive effect of non-vested restricted stock	330	230	279	251
Weighted average number of common shares used in diluted net income per common share	40,073	41,276	40,417	41,671
Net income per common share:
Basic (in dollars per share)	$ 0.61	$ 0.52	$ 1.27	$ 0.94
Diluted (in dollars per share)	$ 0.61	$ 0.51	$ 1.26	$ 0.94
Anti-dilutive shares	414	354	500	388

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