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, 2019
USD ($)
item
property
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]      
Cash paid for interest $ 108,277,000 $ 97,744,000 $ 103,559,000
Interest capitalized 19,325,000 27,047,000 20,240,000
Total indebtedness 2,808,518,000    
Adjusted total indebtedness $ 2,808,518,000 $ 2,792,651,000  
Total indebtedness, weighted average interest rate 3.81% 3.89%  
Discontinued Operations [Member]      
Debt Instrument [Line Items]      
Cash paid for interest $ 1,278,000    
Projects Under Development And Developable Land [Member]      
Debt Instrument [Line Items]      
Number of projects with encumbered company mortgages | item 4    
Carrying value of encumbered properties $ 381,000,000    
Other Property [Member]      
Debt Instrument [Line Items]      
Number of properties with encumbered company mortgages | property 19    
Carrying value of encumbered properties $ 2,900,000,000    
Unconsolidated Joint Venture [Member]      
Debt Instrument [Line Items]      
Interest capitalized 1,339,000 $ 816,000 $ 1,056,000
Revolving Credit Facility Borrowing And Other Variable Rate Mortgage Debt [Member]      
Debt Instrument [Line Items]      
Total indebtedness $ 509,656,000 $ 309,705,000  
Total indebtedness, weighted average interest rate 3.54% 4.90%  
Fixed Rate Debt And Other Obligations [Member]      
Debt Instrument [Line Items]      
Total indebtedness $ 2,298,862,000 $ 2,482,946,000  
Total indebtedness, weighted average interest rate 3.87% 3.76%