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Earnings Per Share (Schedule Of Anti-Dilutive Securities) (Details)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total anti-dilutive securities 3,869 4,731
Share Options [Member]
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total anti-dilutive securities 2,313 [1] 3,147 [1]
Operating Partnership Units [Member]
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total anti-dilutive securities 1,556 1,584
[1] Exclusion results as exercise prices were greater than the average market price for each respective period.