Earnings Per Share (Anti-Dilutive Securities Of Common Shares) (Details) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti-dilutive securities	908		3,483		3,932
Share Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti-dilutive securities	908	[1]	1,929	[1]	2,354	[1]
Operating Partnership Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti-dilutive securities	0		1,554		1,578

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