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Fair Value Measurements (Carrying amounts and fair value of financial instruments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unsecured revolving credit facilities $ 80,000 $ 0
Deferred financing costs, net and other 62,944 74,352
Senior Unsecured Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unsecured debt, gross 850,000 850,000
Deferred financing costs, net and other 6,583 6,386
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 506 1,266
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents, carrying amount 851,306 1,500,227
Mortgages payable, gross 8,164,473 8,203,839
Unsecured revolving credit facilities 80,000 0
Debt instrument - Carrying amount 9,844,473 9,803,839
Deferred financing costs, net and other 62,944 74,352
Carrying Amount | Senior Unsecured Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unsecured debt, gross 850,000 850,000
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]    
Total debt 9,789,000 9,822,000
Fair Value | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents, fair value 851,000 1,500,000
Unsecured revolving credit facilities 80,000 0
Fair Value | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Mortgages payable, gross 8,112,000 8,194,000
Fair Value | Senior Unsecured Notes | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unsecured debt, gross 847,000 878,000
Fair Value | Unsecured Term Loan | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unsecured debt, gross $ 750,000 $ 750,000