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EARNINGS PER SHARE (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 30, 2019
Mar. 31, 2018
Numerator:    
Net income $ 13,033 $ 14,264
Denominator:    
Weighted average number of common shares outstanding - Basic 17,458,020 17,432,829
Dilutive effect of options and restricted stock units outstanding under the Company's employee compensation plans 263,718 203,226
Weighted average number of common shares outstanding - Diluted 17,721,738 17,636,055