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Basis Of Presentation And Summary Of Significant Accounting Policies (Carrying Value Of Indebtedness And Corresponding Estimate Of Fair Value) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Summary Of Significant Accounting Policies [Line Items]    
Mortgage notes payable, net $ 3,189,013 $ 3,435,242
Mezzanine notes payable 307,797 308,482
Unsecured senior notes, net 6,257,274 5,264,819
Estimated Fair Value [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Mortgage notes payable, net 3,243,958 3,503,746
Mezzanine notes payable 309,837 306,103
Unsecured senior notes, net 6,819,623 5,547,738
Total 10,373,418 9,357,587
Carrying Amount [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Mortgage notes payable, net 3,189,013 3,435,242
Mezzanine notes payable 307,797 308,482
Unsecured senior notes, net 6,257,274 5,264,819
Total $ 9,754,084 $ 9,008,543