Earnings Per Share (Schedule Of Anti-Dilutive Securities) (Details) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti-dilutive securities	3,484		3,941		3,484		3,942
Share Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti-dilutive securities	1,929	[1]	2,359	[1]	1,929	[1]	2,359	[1]
Operating Partnership Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti-dilutive securities	1,555		1,582		1,555		1,583

[1] Exclusion results as exercise prices were greater than the average market price for each respective period.