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
Mar. 31, 2021
USD ($)
property
item
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]      
Number of properties with encumbered company mortgages | property 19    
Carrying value of encumbered properties $ 2,900,000,000    
Cash paid for interest 18,087,000 $ 20,990,000  
Interest capitalized 8,583,000 5,856,000  
Total indebtedness $ 2,821,964,000   $ 2,801,797,000
Total indebtedness, weighted average interest rate 3.77%   3.76%
Discontinued Operations [Member]      
Debt Instrument [Line Items]      
Cash paid for interest $ 1,264,000 1,278,000  
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 $ 634,000,000    
Unconsolidated Joint Venture [Member]      
Debt Instrument [Line Items]      
Interest capitalized 338,000 $ 346,000  
Revolving Credit Facility Borrowing And Other Variable Rate Mortgage Debt [Member]      
Debt Instrument [Line Items]      
Total indebtedness $ 447,032,000   $ 427,419,000
Total indebtedness, weighted average interest rate 3.47%   3.38%
Fixed Rate Debt And Other Obligations [Member]      
Debt Instrument [Line Items]      
Total indebtedness $ 2,374,932,000   $ 2,374,378,000
Total indebtedness, weighted average interest rate 3.83%   3.83%