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Earnings Per Share (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Dec. 31, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Numerator:
Net income	$ 31,713	$ 24,753	$ 18,594	$ 15,338	$ 8,208	$ 4,817	$ 6,233	$ 13,033	$ 90,398	$ 32,291	$ 50,933
Denominator:
Weighted average number of common shares outstanding - Basic									17,486,054	17,461,421	17,450,658
Dilutive effect of options and restricted stock units outstanding under the Company's employee compensation plans									283,802	317,411	203,973
Weighted average number of common shares outstanding - Diluted									17,769,856	17,778,832	17,654,631

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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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