Equity And Accumulated Other Comprehensive Loss, Net (Ownership Interest In The Operating Partnership) (Details)	Mar. 31, 2013	Dec. 31, 2012
Equity and Accumulated Other Comprehensive Income (Loss) [Line Items]
Partners' capital account units	128,413,791	125,140,783
Percentage of total	97.70%	97.80%
Common Units Held By Third Parties [Member]
Equity and Accumulated Other Comprehensive Income (Loss) [Line Items]
Common units held by third parties	1,509,814	1,515,814
Percentage of total	1.20%	1.20%
Incentive Units Held By Employees And Directors [Member]
Equity and Accumulated Other Comprehensive Income (Loss) [Line Items]
Incentive units held by employees and directors	1,486,900	1,335,586
Percentage of total	1.10%	1.00%
Noncontrolling Interests In Operating Partnership [Member]
Equity and Accumulated Other Comprehensive Income (Loss) [Line Items]
Partners' capital account units	131,410,505	127,992,183
Percentage of total	100.00%	100.00%