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, 2016
USD ($)
property
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]      
Number of properties with encumbered company mortgages | property 24    
Carrying value of encumbered properties $ 853,000,000    
Cash paid for interest 28,090,000 $ 25,922,000  
Interest capitalized 4,561,000 3,607,000  
Total indebtedness $ 2,281,147,000   $ 2,154,920,000
Total indebtedness, weighted average interest rate 4.95%   5.22%
Projects Under Development And Developable Land [Member]      
Debt Instrument [Line Items]      
Number of properties with encumbered company mortgages | property 4    
Other Property [Member]      
Debt Instrument [Line Items]      
Carrying value of encumbered properties $ 222,000,000    
Revolving Credit Facility Borrowing And Other Variable Rate Mortgage Debt [Member]      
Debt Instrument [Line Items]      
Total indebtedness $ 197,603,000   $ 292,399,000
Total indebtedness, weighted average interest rate 3.40%   2.81%
Fixed Rate Debt And Other Obligations [Member]      
Debt Instrument [Line Items]      
Total indebtedness $ 2,089,638,000   $ 1,862,521,000
Total indebtedness, weighted average interest rate 5.10%   5.60%
Unconsolidated Joint Venture [Member]      
Debt Instrument [Line Items]      
Interest capitalized $ 1,458,000 $ 1,256,000