Quarterly report pursuant to Section 13 or 15(d)

Mortgages, Loans Payable And Other Obligations (Narrative) (Details)

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Mortgages, Loans Payable And Other Obligations (Narrative) (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
item
property
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]        
Number of properties with encumbered company mortgages | property   20    
Carrying value of encumbered properties   $ 3,200,000,000    
Cash paid for interest $ 52,441,000 48,451,000    
Interest capitalized   16,378,000 $ 11,788,000  
Total indebtedness   $ 2,359,284,000   $ 2,801,797,000
Total indebtedness, weighted average interest rate   3.60%   3.76%
Discontinued Operations [Member]        
Debt Instrument [Line Items]        
Cash paid for interest   $ 1,699,000 2,570,000  
Projects Under Development And Developable Land [Member]        
Debt Instrument [Line Items]        
Number of projects with encumbered company mortgages | item   3    
Carrying value of encumbered properties   $ 677,000,000    
Unconsolidated Joint Venture [Member]        
Debt Instrument [Line Items]        
Interest capitalized   338,000 $ 681,000  
Revolving Credit Facility Borrowing And Other Variable Rate Mortgage Debt [Member]        
Debt Instrument [Line Items]        
Total indebtedness   $ 680,864,000   $ 427,419,000
Total indebtedness, weighted average interest rate   8.30%   3.38%
Fixed Rate Debt And Other Obligations [Member]        
Debt Instrument [Line Items]        
Total indebtedness   $ 1,678,420,000   $ 2,374,378,000
Total indebtedness, weighted average interest rate   3.72%   3.83%