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)
 6 Months Ended
Jun. 30, 2016
USD ($)
property
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]      
Number of properties with encumbered company mortgages | property 24    
Carrying value of encumbered properties $ 857,000,000    
Cash paid for interest 61,979,000 $ 53,353,000  
Interest capitalized 9,346,000 7,388,000  
Total indebtedness $ 2,274,798,000   $ 2,154,920,000
Total indebtedness, weighted average interest rate 4.79%   5.22%
Projects Under Development And Developable Land [Member]      
Debt Instrument [Line Items]      
Number of properties with encumbered company mortgages | property 5    
Other Property [Member]      
Debt Instrument [Line Items]      
Carrying value of encumbered properties $ 219,000,000    
Revolving Credit Facility Borrowing And Other Variable Rate Mortgage Debt [Member]      
Debt Instrument [Line Items]      
Total indebtedness $ 254,343,000   $ 292,399,000
Total indebtedness, weighted average interest rate 3.72%   2.81%
Fixed Rate Debt And Other Obligations [Member]      
Debt Instrument [Line Items]      
Total indebtedness $ 2,020,455,000   $ 1,862,521,000
Total indebtedness, weighted average interest rate 4.93%   5.60%
Unconsolidated Joint Venture [Member]      
Debt Instrument [Line Items]      
Interest capitalized $ 2,771,000 $ 2,314,000