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NET INCOME (LOSS) PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 29, 2019
Sep. 30, 2018
Sep. 29, 2019
Sep. 30, 2018
Earnings Per Share [Abstract]        
Net income $ 26,676 $ 24,380 $ 54,358 $ 50,867
Weighted average number of common shares used in basic net income per common share 38,741 39,743 39,090 40,138
Dilutive effect of non-vested restricted stock 472 330 389 279
Weighted average number of common shares used in diluted net income per common share 39,213 40,073 39,479 40,417
Net income per common share:        
Basic (in dollars per share) $ 0.69 $ 0.61 $ 1.39 $ 1.27
Diluted (in dollars per share) $ 0.68 $ 0.61 $ 1.38 $ 1.26
Anti-dilutive shares 220 414 245 500