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NET INCOME (LOSS) PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2019
Apr. 01, 2018
Earnings Per Share [Abstract]    
Net income $ 8,276 $ 8,755
Weighted average number of common shares used in basic net income per common share 39,366 40,443
Dilutive effect of non-vested restricted stock 369 251
Weighted average number of common shares used in diluted net income per common share 39,735 40,694
Net income per common share:    
Basic (in dollars per share) $ 0.21 $ 0.22
Diluted (in dollars per share) $ 0.21 $ 0.22
Anti-dilutive shares 336 548