Earnings Per Share (Potentially Dilutive Shares Excluded From The Denominator For The Purpose Of Computing Diluted Earnings Per Share) (Details)	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]
Potentially Dilutive Securities Excluded from the Denominator	6,914,716	10,205,462	6,986,004	10,272,419
Common Units Of Limited Partnership Interest [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially Dilutive Securities Excluded from the Denominator	6,914,716	7,172,832	6,986,004	7,231,104
Unvested Stock Awards Outstanding [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially Dilutive Securities Excluded from the Denominator		687,551		308,654
Contingently Issuable Share Awards [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially Dilutive Securities Excluded from the Denominator		2,345,079		2,364,550
Options To Acquire Common Shares Outstanding [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially Dilutive Securities Excluded from the Denominator				368,111