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, 2013
property
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]      
Number of properties with encumbered company mortgages 29    
Book value of encumbered properties $ 916,000,000    
Cash paid for interest 123,213,000 120,089,000 116,772,000
Interest capitalized 12,885,000 4,342,000 1,081,000
Total indebtedness 2,362,766,000 2,204,389,000  
Total indebtedness, weighted average interest rate 5.62% 5.86%  
Revolving Credit Facility Borrowing And Other Variable Rate Mortgage Debt [Member]
      
Debt Instrument [Line Items]      
Total indebtedness 80,228,000 77,057,000  
Total indebtedness, weighted average interest rate 2.74% 3.32%  
Fixed Rate Debt And Other Obligations [Member]
      
Debt Instrument [Line Items]      
Total indebtedness 2,282,538,000 2,127,332,000  
Total indebtedness, weighted average interest rate 5.72% 5.95%  
Unconsolidated Joint Venture [Member]
      
Debt Instrument [Line Items]      
Interest capitalized $ 1,326,000 $ 235,000 $ 0