Earnings Per Share (Details) In Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Earnings Per Share [Abstract]
Basic shares (in shares)	64,119	63,886	64,048	63,834
Dilutive shares (in shares)	191	181	203	182
Diluted shares (in shares)	64,310	64,067	64,251	64,016
Weighted-average antidilutive shares (in shares)	1,212	1,327	1,225	1,263

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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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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-Glossary Diluted Earnings Per Share

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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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+ Details