Annual report pursuant to Section 13 and 15(d)

Mortgages, Loans Payable And Other Obligations (Narrative) (Details)

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Mortgages, Loans Payable And Other Obligations (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Mortgages, Loans Payable And Other Obligations [Line Items]      
Number of properties with encumbered company mortgages 32    
Book value of the encumbered property $ 950,891,000    
Cash paid for interest 116,772,000 153,608,000 131,912,000
Interest capitalized 1,081,000 1,912,000 1,401,000
Total indebtedness 1,914,215,000 2,089,494,000  
Total indebtedness, weighted average interest rate 6.46% [1] 5.97%  
Revolving Credit Facility Borrowing And Other Variable Rate Mortgage Debt [Member]
      
Mortgages, Loans Payable And Other Obligations [Line Items]      
Total indebtedness 66,500,000 239,000,000  
Total indebtedness, weighted average interest rate 1.77% 0.90%  
Fixed Rate Debt And Other Obligations [Member]
      
Mortgages, Loans Payable And Other Obligations [Line Items]      
Total indebtedness $ 1,847,715,000 $ 1,850,494,000  
Total indebtedness, weighted average interest rate 6.63% 6.62%  
[1] The actual weighted average LIBOR rate for the Company's outstanding variable rate debt was 0.29 percent as of December 31, 2011.