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Fair Value Measurements (Carrying amounts and fair value of financial instruments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unsecured revolving credit facilities $ 575,000 $ 575,000
Deferred financing costs, net and other 67,077 58,268
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 8,678 10,208
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents, carrying amount 440,151 1,346,684
Mortgages payable, gross 5,883,015 6,099,215
Unsecured revolving credit facilities 575,000 575,000
Debt, Carrying Amount 8,458,015 8,674,215
Carrying Amount | Senior Unsecured Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unsecured debt, gross 1,200,000 1,200,000
Carrying Amount | Unsecured Term Loan    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unsecured debt, gross 800,000 800,000
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt, Fair Value 8,096,000 8,657,000
Fair Value | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents, fair value 440,000 1,347,000
Unsecured revolving credit facilities 575,000 575,000
Fair Value | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Mortgages payable, gross 5,697,000 6,052,000
Fair Value | Senior Unsecured Notes | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unsecured debt, gross 1,024,000 1,230,000
Fair Value | Unsecured Term Loan | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unsecured debt, gross $ 800,000 $ 800,000