Net Income Per Share (Details) - shares shares in Thousands	3 Months Ended	9 Months Ended
Sep. 27, 2020	Sep. 29, 2019	Sep. 27, 2020	Sep. 29, 2019
Common Stock:
Weighted average basic shares outstanding	223,907	230,723	223,521	230,779
Dilutive effect of stock options and restricted shares	4,410	4,995	4,312	5,122
Weighted average diluted shares outstanding	228,317	235,718	227,833	235,901
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,049	3,257	2,117	2,488

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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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.

+ References

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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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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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