Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
Apr. 04, 2017	Mar. 29, 2016
Net Income Per Share
Antidilutive securities excluded from calculation of basic earnings per share (in shares)	600	1,200
Net income per share, basic and diluted
Net income	$ 35,043	$ 33,954
Basic weighted average shares outstanding (in shares)	47,634	48,518
Dilutive effect of equity awards (in shares)	1,576	1,519
Diluted weighted average shares outstanding (in shares)	49,210	50,037
Basic net income per share (in dollars per share)	$ 0.74	$ 0.70
Diluted net income per share (in dollars per share)	$ 0.71	$ 0.68

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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-Publisher FASB
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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 sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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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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