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Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Earnings Per Share [Abstract]
Net income	$ 5,686	$ 15,008	$ 9,508	$ 5,720
Basic weighted shares outstanding (in shares)	9,079	8,900	9,033	8,891
Dilutive effect of share-based awards (in shares)	164	30	152	72
Diluted weighted average shares outstanding (in shares)	9,243	8,930	9,185	8,963
Basic earnings per share (in dollars per share)	$ 0.63	$ 1.69	$ 1.05	$ 0.64
Diluted earnings per share (in dollars per share)	$ 0.62	$ 1.68	$ 1.04	$ 0.64

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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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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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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