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) (USD $)
9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Number Of Properties With Encumbered Company Mortgages 32    
Book value of the encumbered property $ 957,498,000    
Cash paid for interest 99,089,000 127,257,000  
Interest capitalized 875,400 1,327,000  
Total indebtedness 1,886,500,000   2,089,494,000
Weighted average interest rate 6.52%   5.97%
Revolving Credit Facility Borrowings And Other Variable Rate Mortgage Debt [Member]
     
Total indebtedness 38,000,000   239,000,000
Weighted average rate of variable rate mortgage debt 1.38%   0.90%
Fixed Rate Debt And Other Obligations [Member]
     
Total indebtedness $ 1,848,500,000   $ 1,850,494,000
Weighted average interest rate of the indebtedness 6.63%   6.62%