EARNINGS PER SHARE - Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Dec. 29, 2018
EARNINGS PER SHARE
Common stock, outstanding	84,196		84,196
Reconciliation of shares for basic and diluted net income per share
Net income (loss)	$ 2,167	$ (3,261)
Weighted average common shares outstanding—basic	84,196	81,419
Effect of dilutive securities	1,661
Weighted average common shares outstanding—diluted	85,857	81,419
Basic	$ 0.03	$ (0.04)
Diluted	$ 0.03	$ (0.04)