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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
Sep. 30, 2016
Dec. 31, 2015
Summary Of Significant Accounting Policies [Line Items]    
Mortgage notes payable, net $ 2,077,707 $ 3,435,242
Mezzanine notes payable 307,448 308,482
Unsecured senior notes, net 7,243,767 5,264,819
Estimated Fair Value [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Mortgage notes payable, net 2,111,614 3,503,746
Mezzanine notes payable 309,095 306,103
Unsecured senior notes, net 7,761,908 5,547,738
Total 10,182,617 9,357,587
Carrying Amount [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Mortgage notes payable, net 2,077,707 3,435,242
Mezzanine notes payable 307,448 308,482
Unsecured senior notes, net 7,243,767 5,264,819
Total $ 9,628,922 $ 9,008,543