Equity And Accumulated Other Comprehensive Loss, Net (Ownership Interest In The Operating Partnership) (Details)	Sep. 30, 2012	Dec. 31, 2011
Equity and Accumulated Other Comprehensive Income (Loss) [Line Items]
Partners' capital account units	123,261,390	106,039,279
Percentage of total	96.40%	95.60%
Common Units Held By Third Parties [Member]
Equity and Accumulated Other Comprehensive Income (Loss) [Line Items]
Common units held by third parties	3,131,814	3,405,814
Percentage of total	2.40%	3.00%
Incentive Units Held By Employees And Directors [Member]
Equity and Accumulated Other Comprehensive Income (Loss) [Line Items]
Incentive units held by employees and directors	1,494,254	1,530,316
Percentage of total	1.20%	1.40%
Noncontrolling Interests In Operating Partnership [Member]
Equity and Accumulated Other Comprehensive Income (Loss) [Line Items]
Partners' capital account units	127,887,458	110,975,409
Percentage of total	100.00%	100.00%