Summary Of Significant Accounting Policies (Carrying Value Of Indebtedness And Corresponding Estimate Of Fair Value) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Summary Of Significant Accounting Policies [Line Items]
Related party note receivable, net	$ 78,544	$ 78,336
Notes receivable, net	9,674	9,641
Mortgage notes payable, net	3,268,745	3,267,914
Unsecured senior notes, net	9,486,379	9,483,695
Unsecured line of credit	255,000	145,000
Carrying Amount [Member]
Summary Of Significant Accounting Policies [Line Items]
Related party note receivable, net	78,544	78,336
Notes receivable, net	9,674	9,641
Total	88,218	87,977
Mortgage notes payable, net	3,268,745	3,267,914
Unsecured senior notes, net	9,486,379	9,483,695
Unsecured line of credit	255,000	145,000
Total	13,010,124	12,896,609
Estimated Fair Value [Member]
Summary Of Significant Accounting Policies [Line Items]
Related party note receivable, net	82,059	82,867
Notes receivable, net	10,000	10,000
Total	92,059	92,867
Mortgage notes payable, net	3,178,851	3,395,569
Unsecured senior notes, net	9,302,108	9,966,591
Unsecured line of credit	255,000	145,317
Total	$ 12,735,959	$ 13,507,477