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Fair Value Measurements (Carrying Amounts and Fair Value of Financial Instruments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Unsecured revolving credit facilities $ 575,000 $ 575,000
Deferred financing costs, net and other 63,572 58,268
Unsecured Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Debt, carrying amount 800,000 800,000
Deferred financing costs, net and other 6,807 2,188
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Cash equivalents, carrying amount 402,903 1,346,684
Mortgages payable, gross 5,877,615 6,099,215
Unsecured revolving credit facilities 575,000 575,000
Debt, carrying amount 8,452,615 8,674,215
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 Debt    
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 8,093,000 8,657,000
Fair Value | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Cash equivalents, fair value 403,000 1,347,000
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 5,697,000 6,052,000
Fair Value | Senior unsecured notes | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Unsecured debt, gross 1,021,000 1,230,000
Fair Value | Unsecured Debt | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Unsecured debt, gross $ 800,000 $ 800,000