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, 2013
property
Sep. 30, 2012
Dec. 31, 2012
Debt Instrument [Line Items]      
Number of properties with encumbered company mortgages 30    
Book value of encumbered properties $ 989,000,000    
Cash paid for interest 97,284,000 98,191,000  
Interest capitalized 10,262,000 1,427,000  
Total indebtedness 2,368,681,000   2,204,389,000
Total indebtedness, weighted average interest rate 5.62%   5.86%
Revolving Credit Facility Borrowings And Other Variable Rate Mortgage Debt [Member]
     
Debt Instrument [Line Items]      
Total indebtedness 79,400,000   77,057,000
Total indebtedness, weighted average interest rate 2.74%   3.32%
Fixed Rate Debt And Other Obligations [Member]
     
Debt Instrument [Line Items]      
Total indebtedness $ 2,289,281,000   $ 2,127,332,000
Total indebtedness, weighted average interest rate 5.72%   5.95%