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)
 9 Months Ended
Sep. 30, 2021
USD ($)
property
item
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]      
Number of properties with encumbered company mortgages | property 22    
Carrying value of encumbered properties $ 3,500,000,000    
Cash paid for interest 66,755,000 $ 72,874,000  
Interest capitalized 23,645,000 18,658,000  
Total indebtedness $ 2,374,947,000   $ 2,801,797,000
Total indebtedness, weighted average interest rate 3.61%   3.76%
Discontinued Operations [Member]      
Debt Instrument [Line Items]      
Cash paid for interest $ 1,699,000 3,862,000  
Projects Under Development And Developable Land [Member]      
Debt Instrument [Line Items]      
Number of projects with encumbered company mortgages | item 1    
Carrying value of encumbered properties $ 444,000,000    
Unconsolidated Joint Venture [Member]      
Debt Instrument [Line Items]      
Interest capitalized 338,000 $ 1,017,000  
Revolving Credit Facility Borrowing And Other Variable Rate Mortgage Debt [Member]      
Debt Instrument [Line Items]      
Total indebtedness $ 696,048,000   $ 427,419,000
Total indebtedness, weighted average interest rate 3.36%   3.38%
Fixed Rate Debt And Other Obligations [Member]      
Debt Instrument [Line Items]      
Total indebtedness $ 1,678,899,000   $ 2,374,378,000
Total indebtedness, weighted average interest rate 3.72%   3.83%