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Fair Value Measurements (Carrying Amounts and Fair Value of Financial Instruments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Unsecured revolving credit facilities $ 575,000 $ 575,000
Deferred financing costs, net and other 53,163 63,572
Unsecured term loan    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Debt, carrying amount 800,000 800,000
Deferred financing costs, net and other 5,441 6,807
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Cash equivalents, carrying amount 825,720 402,903
Mortgages payable, gross 5,729,615 5,877,615
Unsecured revolving credit facilities 575,000 575,000
Debt, carrying amount 8,304,615 8,452,615
Carrying Amount | Senior unsecured notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Unsecured debt, gross 1,200,000 1,200,000
Carrying Amount | Unsecured term loan    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Unsecured debt, gross 800,000 800,000
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Debt, fair value 8,013,000 8,093,000
Fair Value | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Cash equivalents, fair value 826,000 403,000
Unsecured revolving credit facilities, fair value 575,000 575,000
Fair Value | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Mortgages payable, gross 5,569,000 5,697,000
Fair Value | Senior unsecured notes | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Unsecured debt, gross 1,069,000 1,021,000
Fair Value | Unsecured term loan | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Unsecured debt, gross $ 800,000 $ 800,000