Equity And Accumulated Other Comprehensive Loss, Net (Ownership Interest In The Operating Partnership) (Details)	Jun. 30, 2012	Dec. 31, 2011
Parent Company [Member]
Equity and Accumulated Other Comprehensive Income (Loss) [Line Items]
Partners' capital account units	110,268,388	106,039,279
Percentage of total	95.80%	95.60%
Common Units Held By Third Parties [Member]
Equity and Accumulated Other Comprehensive Income (Loss) [Line Items]
Common units held by third parties	3,235,814	3,405,814
Percentage of total	2.80%	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	1,546,326	1,530,316
Percentage of total	1.40%	1.40%
Noncontrolling Interests In Operating Partnership [Member]
Equity and Accumulated Other Comprehensive Income (Loss) [Line Items]
Partners' capital account units	115,050,528	110,975,409
Percentage of total	100.00%	100.00%