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, 2016
USD ($)
property
item
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]      
Cash paid for interest $ 122,414,000 $ 115,123,000 $ 119,664,000
Interest capitalized 19,316,000 16,217,000 15,470,000
Total indebtedness 2,340,009,000 $ 2,154,920,000  
Adjusted total indebtedness $ 2,357,055,000    
Total indebtedness, weighted average interest rate 3.79% 5.22%  
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 $ 194,800,000    
Other Property [Member]      
Debt Instrument [Line Items]      
Number of properties with encumbered company mortgages | property 13    
Carrying value of encumbered properties $ 970,000,000    
Revolving Credit Facility Borrowing And Other Variable Rate Mortgage Debt [Member]      
Debt Instrument [Line Items]      
Total indebtedness $ 481,282,000 $ 292,399,000  
Total indebtedness, weighted average interest rate 2.93% 2.81%  
Fixed Rate Debt And Other Obligations [Member]      
Debt Instrument [Line Items]      
Total indebtedness $ 1,875,773,000 $ 1,862,521,000  
Total indebtedness, weighted average interest rate 4.01% 5.60%  
Unconsolidated Joint Venture [Member]      
Debt Instrument [Line Items]      
Interest capitalized $ 5,055,000 $ 5,325,000 $ 4,646,000