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Fair Value Measurements (Carrying Amounts and Fair Value of Financial Instruments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unsecured revolving credit facilities $ 575,000 $ 575,000
Deferred financing costs, net and other 49,687 53,163
Senior unsecured notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt, carrying amount 1,200,000 1,200,000
Deferred financing costs, net and other 5,617 6,127
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 675,125 825,720
Mortgages payable 5,729,615 5,729,615
Unsecured revolving credit facilities 575,000 575,000
Debt, carrying amount 8,304,615 8,304,615
Carrying Amount | Senior unsecured notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unsecured term loan 1,200,000 1,200,000
Carrying Amount | Unsecured term loan    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unsecured term loan 800,000 800,000
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt, fair value 8,025,000 8,013,000
Fair Value | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 675,000 826,000
Unsecured revolving credit facilities 575,000 575,000
Fair Value | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Mortgages payable 5,570,000 5,569,000
Fair Value | Senior unsecured notes | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unsecured term loan 1,080,000 1,069,000
Fair Value | Unsecured term loan | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unsecured term loan $ 800,000 $ 800,000