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)
 12 Months Ended
Dec. 31, 2018
USD ($)
property
item
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]      
Cash paid for interest $ 97,744,000 $ 103,559,000 $ 122,414,000
Interest capitalized 27,047,000 20,240,000 19,316,000
Total indebtedness 2,792,651,000    
Adjusted total indebtedness $ 2,807,396,000 $ 2,826,110,000  
Total indebtedness, weighted average interest rate 3.89% 3.93%  
Projects Under Development And Developable Land [Member]      
Debt Instrument [Line Items]      
Number of projects with encumbered company mortgages | item 1    
Carrying value of encumbered properties $ 142,000,000    
Other Property [Member]      
Debt Instrument [Line Items]      
Number of properties with encumbered company mortgages | property 16    
Carrying value of encumbered properties $ 2,100,000,000    
Unconsolidated Joint Venture [Member]      
Debt Instrument [Line Items]      
Interest capitalized 816,000 $ 1,056,000 $ 5,055,000
Revolving Credit Facility Borrowing And Other Variable Rate Mortgage Debt [Member]      
Debt Instrument [Line Items]      
Total indebtedness $ 314,177,000 $ 382,443,000  
Total indebtedness, weighted average interest rate 4.90% 3.63%  
Fixed Rate Debt And Other Obligations [Member]      
Debt Instrument [Line Items]      
Total indebtedness $ 2,493,219,000 $ 2,443,667,000  
Total indebtedness, weighted average interest rate 3.76% 3.98%