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 $)
 3 Months Ended
Mar. 31, 2013
property
Mar. 31, 2012
Dec. 31, 2012
Mortgages Loans Payable And Other Obligations [Line Items]      
Number of properties with encumbered company mortgages 31    
Book value of encumbered properties $ 1,000,000,000    
Cash paid for interest 36,200,000 43,144,000  
Interest capitalized 3,467,000 230,000  
Total indebtedness 2,296,687,000   2,204,389,000
Total indebtedness, weighted average interest rate 5.68%   5.86%
Revolving Credit Facility Borrowing And Other Variable Rate Mortgage Debt [Member]
      
Mortgages Loans Payable And Other Obligations [Line Items]      
Total indebtedness 1,538,987,000   77,057,000
Total indebtedness, weighted average interest rate 4.98%   3.32%
Fixed Rate Debt And Other Obligations [Member]
      
Mortgages Loans Payable And Other Obligations [Line Items]      
Total indebtedness $ 757,700,000   $ 2,127,332,000
Total indebtedness, weighted average interest rate 7.12%   5.95%