EARNINGS PER SHARE (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Numerator:
Net income	$ 24,753	$ 4,817	$ 58,685	$ 24,083
Denominator:
Weighted average number of common shares outstanding - Basic	17,489,642	17,464,238	17,475,819	17,447,908
Dilutive effect of options and restricted stock units outstanding under the Company's employee compensation plans	273,635	154,560	259,655	138,723
Weighted average number of common shares outstanding - Diluted	17,763,277	17,618,798	17,735,474	17,586,631