Annual report pursuant to Section 13 and 15(d)

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

v2.4.0.6
Mortgages, Loans Payable And Other Obligations (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
property
Dec. 31, 2011
Dec. 31, 2010
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 120,089,000 116,772,000 153,608,000
Interest capitalized 4,342,000 1,081,000 1,912,000
Total indebtedness 2,204,389,000 1,914,215,000  
Total indebtedness, weighted average interest rate 5.86% 6.46%  
Revolving Credit Facility Borrowing And Other Variable Rate Mortgage Debt [Member]
      
Mortgages Loans Payable And Other Obligations [Line Items]      
Total indebtedness 77,057,000 66,500,000  
Total indebtedness, weighted average interest rate 3.32% 1.77%  
Fixed Rate Debt And Other Obligations [Member]
      
Mortgages Loans Payable And Other Obligations [Line Items]      
Total indebtedness $ 2,127,332,000 $ 1,847,715,000  
Total indebtedness, weighted average interest rate 5.95% 6.63%