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)
 9 Months Ended
Sep. 30, 2016
USD ($)
property
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]      
Number of properties with encumbered company mortgages | property 21    
Carrying value of encumbered properties $ 1,200,000,000    
Cash paid for interest 89,617,000 $ 85,019,000  
Interest capitalized 14,436,000 11,744,000  
Total indebtedness $ 2,474,148,000   $ 2,154,920,000
Total indebtedness, weighted average interest rate 4.48%   5.22%
Projects Under Development And Developable Land [Member]      
Debt Instrument [Line Items]      
Number of properties with encumbered company mortgages | property 3    
Other Property [Member]      
Debt Instrument [Line Items]      
Carrying value of encumbered properties $ 146,000,000    
Revolving Credit Facility Borrowing And Other Variable Rate Mortgage Debt [Member]      
Debt Instrument [Line Items]      
Total indebtedness $ 261,706,000   $ 292,399,000
Total indebtedness, weighted average interest rate 3.75%   2.81%
Fixed Rate Debt And Other Obligations [Member]      
Debt Instrument [Line Items]      
Total indebtedness $ 2,212,442,000   $ 1,862,521,000
Total indebtedness, weighted average interest rate 4.56%   5.60%
Unconsolidated Joint Venture [Member]      
Debt Instrument [Line Items]      
Interest capitalized $ 3,937,000 $ 3,769,000