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Summary Of Significant Accounting Policies (Carrying Value Of Indebtedness And Corresponding Estimate Of Fair Value) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Summary Of Significant Accounting Policies [Line Items]    
Related party note receivable, net $ 77,552 $ 80,000
Notes receivable, net 18,729 15,920
Mortgage notes payable, net 2,909,081 2,922,408
Unsecured senior notes, net 9,639,287 8,390,459
Unsecured line of credit 0 0
Unsecured term loan, net 499,390 498,939
Total 2,931,986  
Carrying Amount [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Related party note receivable, net 77,552 80,000
Notes receivable, net 18,729 15,920
Total 96,281 95,920
Mortgage notes payable, net 2,909,081 2,922,408
Unsecured senior notes, net 9,639,287 8,390,459
Unsecured line of credit 0 0
Unsecured term loan, net 499,390 498,939
Total 13,047,758 11,811,806
Estimated Fair Value [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Related party note receivable, net 84,579 81,931
Notes receivable, net 19,372 14,978
Total 103,951 96,909
Mortgage notes payable, net 3,144,150 2,984,956
Unsecured senior notes, net 10,620,527 8,826,375
Unsecured line of credit 0 0
Unsecured term loan, net 500,326 500,561
Total $ 14,265,003 $ 12,311,892