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Common And Common Equivalent Shares (Schedule Of Calculation Of Shares Used In The Basic And Diluted Net Income Per Share) (Details) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Common And Common Equivalent Shares [Abstract]
Weighted average number of common shares outstanding	48,269	47,149
Weighted average number of dilutive common share equivalents	1,130	1,212
Weighted average number of common and common equivalent shares outstanding	49,399	48,361
Antidilutive securities not included in the dilutive earnings per share calculation	28	37

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Weighted average number of dilutive share equivalents.

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Antidilution

-URI http://asc.fasb.org/extlink&oid=6505113



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-Name Statement of Financial Accounting Standard (FAS)

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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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