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, 2012
Mar. 31, 2011
Dec. 31, 2011
Mortgages Loans Payable And Other Obligations [Line Items]      
Number of properties with encumbered company mortgages 31    
Book value of the encumbered property $ 931,200,000    
Cash paid for interest 43,144,000 40,852,000  
Interest capitalized 230,000 550,000  
Total indebtedness 1,940,715,000   1,914,215,000
Total indebtedness, weighted average interest rate 6.15%   6.46%
Revolving Credit Facility Borrowing And Other Variable Rate Mortgage Debt [Member]
      
Mortgages Loans Payable And Other Obligations [Line Items]      
Total indebtedness 210,000,000   66,500,000
Total indebtedness, weighted average interest rate 1.54%   1.77%
Fixed Rate Debt And Other Obligations [Member]
      
Mortgages Loans Payable And Other Obligations [Line Items]      
Total indebtedness $ 1,730,715,000   $ 1,847,715,000
Total indebtedness, weighted average interest rate 6.70%   6.63%