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Earnings Per Share (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Numerator:
Net income	$ 8,208	$ 4,817	$ 6,233	$ 13,033	$ 12,274	$ 9,206	$ 15,189	$ 14,264	$ 32,291	$ 50,933	$ 52,142
Denominator:
Weighted average number of common shares outstanding - Basic									17,461,421	17,450,658	17,725,494
Dilutive effect of options and restricted stock units outstanding under the Company's employee compensation plans									317,411	203,973	213,596
Weighted average number of common shares outstanding - Diluted									17,778,832	17,654,631	17,939,090

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- Definition

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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