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)
 6 Months Ended
Jun. 30, 2015
USD ($)
property
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]      
Number of properties with encumbered company mortgages | property 26    
Book value of encumbered properties $ 932,000,000    
Cash paid for interest 53,353,000 $ 61,999,000  
Interest capitalized 7,388,000 6,493,000  
Total indebtedness $ 2,034,819,000   $ 2,088,654,000
Weighted Average [Member]      
Debt Instrument [Line Items]      
Total indebtedness, weighted average interest rate 5.67%   5.64%
Revolving Credit Facility Borrowing And Other Variable Rate Mortgage Debt [Member]      
Debt Instrument [Line Items]      
Total indebtedness $ 139,543,000   $ 159,860,000
Total indebtedness, weighted average interest rate 3.89%   3.83%
Fixed Rate Debt And Other Obligations [Member]      
Debt Instrument [Line Items]      
Total indebtedness $ 1,895,276,000   $ 1,928,794,000
Total indebtedness, weighted average interest rate 5.80%   5.79%
Unconsolidated Joint Venture [Member]      
Debt Instrument [Line Items]      
Interest capitalized $ 2,314,000 $ 1,953,000