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NET INCOME PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 30, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 31, 2017	Oct. 01, 2017	Jul. 02, 2017	Apr. 02, 2017	Dec. 30, 2018	Dec. 31, 2017	Jan. 01, 2017
Earnings Per Share [Abstract]
Net income (loss)	$ 14,887	$ 24,380	$ 17,732	$ 8,755	$ 16,427	$ 21,221	$ 13,134	$ 4,674	$ 65,754	$ 55,456	$ (15,251)
Weighted average number of common shares used in basic net income (loss) per common share									39,985	41,202	41,648
Dilutive effect of non-vested restricted stock									290	239	0
Weighted average number of common shares used in diluted net income (loss) per common share									40,275	41,441	41,648
Net income (loss) per common share:
Basic (in dollars per share)	$ 0.38	$ 0.61	$ 0.44	$ 0.22	$ 0.41	$ 0.52	$ 0.32	$ 0.11	$ 1.64	$ 1.35	$ (0.37)
Diluted (in dollars per share)	$ 0.37	$ 0.61	$ 0.44	$ 0.22	$ 0.40	$ 0.51	$ 0.31	$ 0.11	$ 1.63	$ 1.34	$ (0.37)
Anti-dilutive shares									538	418	0

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