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)
 9 Months Ended
Sep. 30, 2015
USD ($)
property
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]      
Number of properties with encumbered company mortgages | property 24    
Book value of encumbered properties $ 917,000,000    
Cash paid for interest 85,019,000 $ 92,096,000  
Interest capitalized 11,744,000 10,650,000  
Total indebtedness $ 2,043,592,000   $ 2,088,654,000
Total indebtedness, weighted average interest rate 5.41%   5.64%
Revolving Credit Facility Borrowing And Other Variable Rate Mortgage Debt [Member]      
Debt Instrument [Line Items]      
Total indebtedness $ 177,839,000   $ 159,860,000
Total indebtedness, weighted average interest rate 3.41%   3.83%
Fixed Rate Debt And Other Obligations [Member]      
Debt Instrument [Line Items]      
Total indebtedness $ 1,865,753,000   $ 1,928,794,000
Total indebtedness, weighted average interest rate 5.60%   5.79%
Unconsolidated Joint Venture [Member]      
Debt Instrument [Line Items]      
Interest capitalized $ 3,769,000 $ 3,284,000