Stock-Based Compensation And Earnings Per Share (Reconciliation Of Average Shares Outstanding) (Details)	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011
Stock-Based Compensation And Earnings Per Share [Abstract]
Basic average shares outstanding	92,265,059	92,335,090
Net effect of stock options assumed to be exercised		13,071
Net effect of non-vested restricted stock assumed to be vested		30,577
Diluted average shares outstanding	92,265,059	92,378,738

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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