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, 2017
USD ($)
property
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]      
Number of properties with encumbered company mortgages | property 14    
Carrying value of encumbered properties $ 1,400,000,000    
Cash paid for interest 15,180,000 $ 28,090,000  
Interest capitalized 4,997,000 4,561,000  
Total indebtedness $ 2,751,244,000   $ 2,357,055,000
Total indebtedness, weighted average interest rate 3.81%   3.79%
Projects Under Development And Developable Land [Member]      
Debt Instrument [Line Items]      
Number of properties with encumbered company mortgages | property 6    
Other Property [Member]      
Debt Instrument [Line Items]      
Carrying value of encumbered properties $ 326,000,000    
Revolving Credit Facility Borrowing And Other Variable Rate Mortgage Debt [Member]      
Debt Instrument [Line Items]      
Total indebtedness $ 652,400,000   $ 481,282,000
Total indebtedness, weighted average interest rate 3.16%   2.93%
Fixed Rate Debt And Other Obligations [Member]      
Debt Instrument [Line Items]      
Total indebtedness $ 2,098,844,000   $ 1,875,773,000
Total indebtedness, weighted average interest rate 4.01%   4.01%
Unconsolidated Joint Venture [Member]      
Debt Instrument [Line Items]      
Interest capitalized $ 1,009,000 $ 1,458,000