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Fair Value Measurements (Carrying amounts and fair value of financial instruments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unsecured revolving credit facilities $ 655,000 $ 80,000
Deferred financing costs, net and other 41,523 59,226
Senior Unsecured Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unsecured debt, gross 450,000 850,000
Deferred financing costs, net and other 4,332 5,998
Unsecured Term Loan    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unsecured debt, gross 750,000 750,000
Deferred financing costs, net and other 4,415 5,179
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents, carrying amount 979,060 261,981
Mortgages payable, gross 5,673,671 8,215,847
Unsecured revolving credit facilities 655,000 80,000
Debt, Carrying Amount 7,528,671 9,895,847
Carrying Amount | Senior Unsecured Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unsecured debt, gross 450,000 850,000
Carrying Amount | Unsecured Term Loan    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unsecured debt, gross 750,000 750,000
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt, Fair Value 7,595,000 9,856,000
Fair Value | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents, fair value 979,000 262,000
Unsecured revolving credit facilities 655,000 80,000
Fair Value | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Mortgages payable, gross 5,725,000 8,179,000
Fair Value | Senior Unsecured Notes | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unsecured debt, gross 465,000 847,000
Fair Value | Unsecured Term Loan | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unsecured debt, gross $ 750,000 $ 750,000