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NET INCOME PER SHARE - Net Income and Diluted Common Shares (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 29, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 30, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net income	$ 8,715	$ 26,676	$ 19,406	$ 8,276	$ 14,887	$ 24,380	$ 17,732	$ 8,755	$ 63,073	$ 65,754	$ 55,456
Weighted average number of common shares used in basic net income per common share									38,778	39,985	41,202
Dilutive effect of non-vested restricted stock									401	290	239
Weighted average number of common shares used in diluted net income per common share									39,179	40,275	41,441
Net income per common share:
Basic (in dollars per share)	$ 0.23	$ 0.69	$ 0.50	$ 0.21	$ 0.38	$ 0.61	$ 0.44	$ 0.22	$ 1.63	$ 1.64	$ 1.35
Diluted (in dollars per share)	$ 0.23	$ 0.68	$ 0.49	$ 0.21	$ 0.37	$ 0.61	$ 0.44	$ 0.22	$ 1.61	$ 1.63	$ 1.34
Anti-dilutive shares									225	538	418

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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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