Quarterly report pursuant to Section 13 or 15(d)

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

v3.10.0.1
Mortgages, Loans Payable And Other Obligations (Narrative) (Details)
 9 Months Ended
Sep. 30, 2018
USD ($)
property
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]      
Number of properties with encumbered company mortgages | property 16    
Carrying value of encumbered properties $ 2,000,000,000    
Cash paid for interest 66,044,000 $ 70,114,000  
Interest capitalized 21,274,000 13,955,000  
Total indebtedness $ 2,821,793,000   $ 2,826,110,000
Total indebtedness, weighted average interest rate 3.83%   3.93%
Projects Under Development And Developable Land [Member]      
Debt Instrument [Line Items]      
Number of properties with encumbered company mortgages | property 1    
Other Property [Member]      
Debt Instrument [Line Items]      
Carrying value of encumbered properties $ 135,000,000    
Unconsolidated Joint Venture [Member]      
Debt Instrument [Line Items]      
Interest capitalized 562,000 $ 1,009,000  
Revolving Credit Facility Borrowing And Other Variable Rate Mortgage Debt [Member]      
Debt Instrument [Line Items]      
Total indebtedness $ 525,170,000   $ 382,443,000
Total indebtedness, weighted average interest rate 4.41%   3.63%
Fixed Rate Debt And Other Obligations [Member]      
Debt Instrument [Line Items]      
Total indebtedness $ 2,296,623,000   $ 2,443,667,000
Total indebtedness, weighted average interest rate 3.69%   3.98%