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Fair Value Measurements (Carrying amounts and fair value of financial instruments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unsecured revolving credit facilities $ 1,075,000 $ 575,000
Deferred financing costs, net and other 35,171 38,407
Senior Unsecured Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt, Carrying Amount 450,000 450,000
Deferred financing costs, net and other 3,924 4,128
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents, carrying amount 1,422,502 1,276,815
Mortgages payable, gross 5,670,928 5,670,016
Unsecured revolving credit facilities 1,075,000 575,000
Debt, Carrying Amount 7,995,928 7,445,016
Carrying Amount | Senior Unsecured Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unsecured debt, gross 450,000 450,000
Carrying Amount | Unsecured Term Loan    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unsecured debt, gross 800,000 750,000
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt, Fair Value 7,998,000 7,507,000
Fair Value | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents, fair value 1,423,000 1,277,000
Unsecured revolving credit facilities 1,075,000 575,000
Fair Value | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Mortgages payable, gross 5,689,000 5,714,000
Fair Value | Senior Unsecured Notes | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unsecured debt, gross 434,000 468,000
Fair Value | Unsecured Term Loan | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unsecured debt, gross $ 800,000 $ 750,000