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Fair Value Measurements (Carrying amounts and fair value of financial instruments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unsecured revolving credit facilities $ 575,000 $ 575,000
Deferred financing costs, net and other 59,960 63,572
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 7,147 8,168
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 810,395 402,903
Mortgages payable 5,761,815 5,877,615
Unsecured revolving credit facilities 575,000 575,000
Debt, carrying amount 8,336,815 8,452,615
Carrying Amount | Senior unsecured notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior unsecured notes 1,200,000 1,200,000
Carrying Amount | Unsecured term loan    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior unsecured notes 800,000 800,000
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt, fair value 7,983,000 8,093,000
Fair Value | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 810,000 403,000
Unsecured revolving credit facilities 575,000 575,000
Fair Value | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Mortgages payable 5,592,000 5,697,000
Fair Value | Senior unsecured notes | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior unsecured notes 1,016,000 1,021,000
Fair Value | Unsecured term loan | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior unsecured notes $ 800,000 $ 800,000