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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 $)
Mar. 31, 2013
Dec. 31, 2012
Summary Of Significant Accounting Policies [Line Items]    
Mortgage notes payable $ 3,053,798,000 $ 3,102,485,000
Unsecured senior notes 4,639,843,000 4,639,528,000
Unsecured exchangeable senior notes 1,177,877,000 1,170,356,000
Carrying Amount [Member]
   
Summary Of Significant Accounting Policies [Line Items]    
Mortgage notes payable 3,053,798,000 3,102,485,000
Unsecured senior notes 4,639,843,000 4,639,528,000
Unsecured exchangeable senior notes 1,177,877,000 [1] 1,170,356,000 [1]
Total 8,871,518,000 8,912,369,000
Estimated Fair Value [Member]
   
Summary Of Significant Accounting Policies [Line Items]    
Mortgage notes payable 3,203,402,000 3,256,940,000
Unsecured senior notes 5,194,150,000 5,162,486,000
Unsecured exchangeable senior notes 1,235,835,000 1,278,554,000
Total 9,633,387,000 9,697,980,000
ASC 470-20 Adjustment [Member]
   
Summary Of Significant Accounting Policies [Line Items]    
Impact of accounting pronouncement $ 18,300,000 $ 25,500,000
[1] Includes the net impact of Accounting Standards Codification (“ASC”) ASC 470-20 totaling approximately $18.3 million and $25.5 million at March 31, 2013 and December 31, 2012, respectively.