Annual report pursuant to Section 13 and 15(d)

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

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Mortgages, Loans Payable And Other Obligations (Narrative) (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
item
property
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]      
Cash paid for interest $ 103,543,000 $ 108,277,000 $ 97,744,000
Interest capitalized 26,443,000 19,325,000 27,047,000
Total indebtedness 2,801,797,000    
Adjusted total indebtedness $ 2,801,797,000 $ 2,808,518,000  
Total indebtedness, weighted average interest rate 3.76% 3.81%  
Discontinued Operations [Member]      
Debt Instrument [Line Items]      
Cash paid for interest $ 5,139,000 $ 5,125,000 6,280,000
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 $ 585,000,000    
Other Property [Member]      
Debt Instrument [Line Items]      
Number of properties with encumbered company mortgages | property 19    
Carrying value of encumbered properties $ 2,900,000,000    
Unconsolidated Joint Venture [Member]      
Debt Instrument [Line Items]      
Interest capitalized 1,367,000 1,339,000 $ 816,000
Revolving Credit Facility Borrowing And Other Variable Rate Mortgage Debt [Member]      
Debt Instrument [Line Items]      
Total indebtedness $ 427,419,000 $ 509,656,000  
Total indebtedness, weighted average interest rate 3.38% 3.54%  
Fixed Rate Debt And Other Obligations [Member]      
Debt Instrument [Line Items]      
Total indebtedness $ 2,374,378,000 $ 2,298,862,000  
Total indebtedness, weighted average interest rate 3.83% 3.87%