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, 2019
USD ($)
property
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]      
Number of properties with encumbered company mortgages | property 16    
Carrying value of encumbered properties $ 2,100,000,000    
Cash paid for interest 21,967,000 $ 19,103,000  
Interest capitalized 4,297,000 7,109,000  
Total indebtedness $ 2,701,345,000   $ 2,807,396,000
Total indebtedness, weighted average interest rate 3.93%   3.89%
Projects Under Development And Developable Land [Member]      
Debt Instrument [Line Items]      
Number of properties with encumbered company mortgages | property 1    
Other Property [Member]      
Debt Instrument [Line Items]      
Carrying value of encumbered properties $ 152,000,000    
Unconsolidated Joint Venture [Member]      
Debt Instrument [Line Items]      
Interest capitalized 285,000 $ 166,000  
Revolving Credit Facility Borrowing And Other Variable Rate Mortgage Debt [Member]      
Debt Instrument [Line Items]      
Total indebtedness $ 181,548,000   $ 314,177,000
Total indebtedness, weighted average interest rate 5.77%   4.90%
Fixed Rate Debt And Other Obligations [Member]      
Debt Instrument [Line Items]      
Total indebtedness $ 2,519,797,000   $ 2,493,219,000
Total indebtedness, weighted average interest rate 3.80%   3.76%