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Mortgages, Notes and Loans Payable, Net (Borrowings Activity, Footnotes) (Details)
1 Months Ended 3 Months Ended
Feb. 28, 2021
USD ($)
Mar. 31, 2021
USD ($)
extention_option
Mar. 31, 2020
USD ($)
Dec. 31, 2020
Debt Instrument [Line Items]        
Interest rate   2.00%    
Loss on extinguishment of debt   $ 35,915,000 $ 0  
Repayments   1,283,512,000 $ 5,115,000  
Interest rate cap        
Debt Instrument [Line Items]        
Notional amount   368,200,000    
1201 Lake Robbins        
Debt Instrument [Line Items]        
Repayments $ 280,300,000 273,070,000    
Loss on settlement of rate-lock agreement 10,000,000.0      
Construction Loans | Victoria Place        
Debt Instrument [Line Items]        
Face amount   $ 368,200,000    
Number of extension options | extention_option   2    
Term of extension option   1 year    
Senior Notes due 2029 | Senior Notes        
Debt Instrument [Line Items]        
Face amount $ 650,000,000      
Interest rate (as a percent) 4.125% 4.125%    
Senior Notes due 2031 | Senior Notes        
Debt Instrument [Line Items]        
Face amount $ 650,000,000      
Interest rate (as a percent) 4.375% 4.375%    
Senior Notes due 2025 | Senior Notes        
Debt Instrument [Line Items]        
Interest rate (as a percent) 5.375%     5.375%
Repurchased, face amount $ 1,000,000,000.0      
Loss on extinguishment of debt $ 35,100,000      
Repayments   $ 1,000,000,000    
One-month LIBOR        
Debt Instrument [Line Items]        
Interest rate margin (as a percent)   0.11%    
Three-month LIBOR        
Debt Instrument [Line Items]        
Interest rate margin (as a percent)   0.19%    
Prime rate        
Debt Instrument [Line Items]        
Interest rate margin (as a percent)   3.25%    
LIBOR | Construction Loans | Victoria Place        
Debt Instrument [Line Items]        
Interest rate margin (as a percent)   5.00%    
Variable rate cap   2.00%    
Variable rate floor   0.25%