Earnings Per Share (Schedule of Reconciliation of Number of Shares Utilized in Earnings Per Share Calculations) (Details) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013	Jul. 01, 2012
Earnings Per Share [Abstract]
Number of common shares-basic	111,575	113,515	112,515	113,306
Effect of dilutive securities, Stock options	913	824	981	825
Effect of dilutive securities, Restricted stock	230	239	221	217
Number of common shares-diluted	112,718	114,578	113,717	114,348
Number of potentially dilutive securities excluded from calculation due to antidilutive impact	535	1,457	507	1,482

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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+ Details

- Definition

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.

+ References+ Details

- Definition

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.

+ References

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-URI http://asc.fasb.org/extlink&oid=6528421

+ Details