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, 2019
USD ($)
property
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]      
Number of properties with encumbered company mortgages | property 21    
Carrying value of encumbered properties $ 3,200,000,000    
Cash paid for interest 75,120,000 $ 66,044,000  
Interest capitalized 14,315,000 21,274,000  
Total indebtedness $ 3,169,550,000   $ 2,807,396,000
Total indebtedness, weighted average interest rate 3.86%   3.89%
Unconsolidated Joint Venture [Member]      
Debt Instrument [Line Items]      
Interest capitalized $ 990,000 $ 562,000  
Revolving Credit Facility Borrowing And Other Variable Rate Mortgage Debt [Member]      
Debt Instrument [Line Items]      
Total indebtedness $ 340,594,000   $ 314,177,000
Total indebtedness, weighted average interest rate 4.14%   4.90%
Fixed Rate Debt And Other Obligations [Member]      
Debt Instrument [Line Items]      
Total indebtedness $ 2,828,956,000   $ 2,493,219,000
Total indebtedness, weighted average interest rate 3.82%   3.76%