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Summary Of Significant Accounting Policies (Carrying Value Of Indebtedness And Corresponding Estimate Of Fair Value) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Summary Of Significant Accounting Policies [Line Items]    
Related party note receivable, net $ 78,520 $ 80,000
Notes receivable, net 25,480 15,920
Mortgage notes payable, net 2,915,852 2,922,408
Unsecured senior notes, net 9,633,577 8,390,459
Unsecured line of credit 0 0
Unsecured term loan, net 499,150 498,939
Carrying Amount [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Related party note receivable, net 78,520 80,000
Notes receivable, net 25,480 15,920
Total 104,000 95,920
Mortgage notes payable, net 2,915,852 2,922,408
Unsecured senior notes, net 9,633,577 8,390,459
Unsecured line of credit 0 0
Unsecured term loan, net 499,150 498,939
Total 13,048,579 11,811,806
Estimated Fair Value [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Related party note receivable, net 85,394 81,931
Notes receivable, net 25,648 14,978
Total 111,042 96,909
Mortgage notes payable, net 3,155,771 2,984,956
Unsecured senior notes, net 10,517,869 8,826,375
Unsecured line of credit 0 0
Unsecured term loan, net 500,450 500,561
Total $ 14,174,090 $ 12,311,892