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, 2020
USD ($)
property
item
Mar. 31, 2019
USD ($)
Dec. 31, 2019
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 20,990,000 $ 21,967,000  
Interest capitalized 5,856,000 4,297,000  
Total indebtedness $ 2,877,121,000   $ 2,808,518,000
Total indebtedness, weighted average interest rate 3.70%   3.81%
Discontinued Operations [Member]      
Debt Instrument [Line Items]      
Cash paid for interest $ 1,278,000 1,937,000  
Projects Under Development And Developable Land [Member]      
Debt Instrument [Line Items]      
Number of projects with encumbered company mortgages | item 4    
Carrying value of encumbered properties $ 470,000,000    
Unconsolidated Joint Venture [Member]      
Debt Instrument [Line Items]      
Interest capitalized 346,000 $ 285,000  
Revolving Credit Facility Borrowing And Other Variable Rate Mortgage Debt [Member]      
Debt Instrument [Line Items]      
Total indebtedness $ 545,000,000   $ 509,656,000
Total indebtedness, weighted average interest rate 3.02%   3.54%
Fixed Rate Debt And Other Obligations [Member]      
Debt Instrument [Line Items]      
Total indebtedness $ 2,332,121,000   $ 2,298,862,000
Total indebtedness, weighted average interest rate 3.86%   3.87%