Earnings Per Share (Potentially Dilutive Shares Excluded From The Denominator For The Purpose Of Computing Diluted Earnings Per Share) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities excluded from the denominator (in shares)	6,944,496	7,257,604	7,022,238	10,003,220
Common Units Of Limited Partnership Interest [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities excluded from the denominator (in shares)	6,944,496	7,257,604	7,022,238	7,260,561
Unvested Stock Awards Outstanding [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities excluded from the denominator (in shares)
Contingently Issuable Share Awards [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities excluded from the denominator (in shares)				2,188,470
Options To Acquire Common Shares Outstanding [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities excluded from the denominator (in shares)				554,189