EARNINGS PER SHARE - Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Reconciliation of shares for basic and diluted net income per share
Net income	$ 33,482	$ 22,223	$ 41,962	$ 24,390
Weighted average common shares outstanding—basic (in shares)	86,937	84,577	86,883	84,387
Effect of dilutive securities (in shares)	540	1,650	586	1,655
Weighted average common shares outstanding—diluted (in shares)	87,477	86,227	87,469	86,042
Earnings per share
Basic (in dollars per share)	$ 0.39	$ 0.26	$ 0.48	$ 0.29
Diluted (in dollars per share)	$ 0.38	$ 0.26	$ 0.48	$ 0.28