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Fair Value Measurements (Carrying amounts and fair value of financial instruments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Unsecured revolving credit facilities - Carrying Amount $ 575,000 $ 80,000
Deferred financing costs, net and other 38,407 59,226
Senior Unsecured Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Unsecured debt, gross 450,000 850,000
Deferred financing costs, net and other 4,128 5,998
Unsecured Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Unsecured debt, gross 750,000 750,000
Deferred financing costs, net and other 4,160 5,179
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Cash equivalents - Carrying Amount 1,276,815 261,981
Mortgages payable, gross 5,670,016 8,215,847
Unsecured revolving credit facilities - Carrying Amount 575,000 80,000
Long-term debt - Carrying Amount 7,445,016 9,895,847
Carrying Amount | Senior Unsecured Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Unsecured debt, gross 450,000 850,000
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 7,507,000 9,856,000
Fair Value | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Cash Equivalents - Fair Value 1,277,000 262,000
Unsecured revolving credit facilities - Fair Value 575,000 80,000
Fair Value | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Mortgages payable, gross 5,714,000 8,179,000
Fair Value | Senior Unsecured Notes | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Unsecured debt, gross 468,000 847,000
Fair Value | Unsecured Debt | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Unsecured debt, gross $ 750,000 $ 750,000