Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
Apr. 02, 2016	Apr. 04, 2015
Earnings Per Share
Net income	$ 5,808	$ 6,378
Shares used in computing basic earnings per share	41,629	42,412
Effect of dilutive securities:
Stock options and other stock-based awards (in shares)	570	737
Shares used in computing diluted earnings per share	42,199	43,149
Earnings per share:
Basic (in dollars per share)	$ 0.14	$ 0.15
Diluted (in dollars per share)	$ 0.14	$ 0.15
Shares excluded from computation of diluted earning per share	800	100

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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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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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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