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Common And Common Equivalent Shares (Details) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Common And Common Equivalent Shares [Abstract]
Weighted average number of common shares outstanding	47,990	46,788	47,564	46,535
Weighted average number of dilutive common share equivalents	945	694	1,119	891
Weighted average number of common and common equivalent shares outstanding	48,935	47,482	48,683	47,426
Antidilutive securities not included in the dilutive earnings per share calculation	42	1,382	47	737

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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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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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