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 $)
 6 Months Ended
Jun. 30, 2013
property
Jun. 30, 2012
Dec. 31, 2012
Mortgages Loans Payable And Other Obligations [Line Items]      
Number of properties with encumbered company mortgages 30    
Book value of encumbered properties $ 995,000,000    
Cash paid for interest 60,838,000 61,144,000  
Interest capitalized 6,748,000 536,000  
Total indebtedness 2,369,153,000   2,204,389,000
Total indebtedness, weighted average interest rate 5.64%   5.86%
Revolving Credit Facility Borrowings And Other Variable Rate Mortgage Debt [Member]
      
Mortgages Loans Payable And Other Obligations [Line Items]      
Total indebtedness 78,855,000   77,057,000
Total indebtedness, weighted average interest rate 3.32%   3.32%
Fixed Rate Debt And Other Obligations [Member]
      
Mortgages Loans Payable And Other Obligations [Line Items]      
Total indebtedness $ 2,290,298,000   $ 2,127,332,000
Total indebtedness, weighted average interest rate 5.72%   5.95%