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Fair Value Measurements (Carrying amounts and fair value of financial instruments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Unsecured revolving credit facilities - Carrying Amount $ 80,000 $ 0
Deferred financing costs, net and other 59,226 74,352
Senior Unsecured Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Unsecured debt, gross 850,000 850,000
Deferred financing costs, net and other 5,998 6,386
Unsecured Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Unsecured debt, gross 750,000 750,000
Deferred financing costs, net and other 5,179 1,266
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Cash equivalents - Carrying Amount 261,981 1,500,227
Mortgages payable, gross 8,215,847 8,203,839
Unsecured revolving credit facilities - Carrying Amount 80,000 0
Long-term debt - Carrying Amount 9,895,847 9,803,839
Carrying Amount | Senior Unsecured Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Unsecured debt, gross 850,000 850,000
Carrying Amount | Unsecured Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Unsecured debt, gross 750,000 750,000
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Long-term debt - Fair Value 9,856,000 9,822,000
Fair Value | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Cash Equivalents - Fair Value 262,000 1,500,000
Unsecured revolving credit facilities - Fair Value 80,000 0
Fair Value | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Mortgages payable, gross 8,179,000 8,194,000
Fair Value | Senior Unsecured Notes | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Unsecured debt, gross 847,000 878,000
Fair Value | Unsecured Debt | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Unsecured debt, gross $ 750,000 $ 750,000