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EARNINGS PER SHARE (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Numerator:
Net income	$ 9,206	$ 9,370	$ 38,659	$ 41,793
Denominator:
Weighted average number of common shares outstanding - Basic	17,458,020	17,590,341	17,448,141	17,826,137
Dilutive effect of options and restricted stock units outstanding under the Company's employee compensation plans	261,263	222,232	209,126	192,038
Weighted average number of common shares outstanding - Diluted	17,719,283	17,812,573	17,657,267	18,018,175

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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