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EARNINGS PER SHARE (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 29, 2019
Jun. 30, 2018
Jun. 29, 2019
Jun. 30, 2018
Numerator:        
Net income $ 6,233 $ 15,189 $ 19,266 $ 29,453
Denominator:        
Weighted average number of common shares outstanding - Basic 17,474,221 17,453,404 17,466,210 17,443,174
Dilutive effect of options and restricted stock units outstanding under the Company's employee compensation plans 196,220 197,155 170,986 140,909
Weighted average number of common shares outstanding - Diluted 17,670,441 17,650,559 17,637,196 17,584,083