Quarterly report pursuant to Section 13 or 15(d)

Investments In Unconsolidated Joint Ventures (Narrative) (Details)

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Investments In Unconsolidated Joint Ventures (Narrative) (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
ft²
property
item
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
ft²
property
item
Dec. 31, 2017
USD ($)
Schedule of Equity Method Investments [Line Items]        
Carrying Value $ 230,614   $ 230,614 $ 252,626
Number of units | item 1,153   1,153  
Amount outstanding $ 870,313   $ 870,313 822,288
Management, leasing, development and other services fees 500 $ 700    
Accounts receivable due from unconsolidated joint ventures 400   400 $ 700
Maximum exposure to loss 164,200   164,200  
Estimated future funding commitments $ 35,800   $ 35,800  
Unconsolidated Joint Venture Office Buildings [Member]        
Schedule of Equity Method Investments [Line Items]        
Number of properties | property 4   4  
Area of property (in square feet) | ft² 500,000   500,000  
Unconsolidated Joint Venture Retail Buildings [Member]        
Schedule of Equity Method Investments [Line Items]        
Number of properties | property 2   2  
Area of mixed use project (in square feet) | ft²     81,700  
Unconsolidated Joint Venture Multi-Family Properties [Member]        
Schedule of Equity Method Investments [Line Items]        
Number of properties | property 8   8  
Number of units | item 2,922   2,922  
Unconsolidated Joint Venture Hotel [Member]        
Schedule of Equity Method Investments [Line Items]        
Number of units | item 351   351  
Unconsolidated Joint Venture Development Projects [Member]        
Schedule of Equity Method Investments [Line Items]        
Number of units | item 360   360  
Unconsolidated Joint Venture Land Parcels [Member]        
Schedule of Equity Method Investments [Line Items]        
Number of units | item 3,738   3,738  
Unconsolidated Joint Ventures [Member] | Guarantee of Indebtedness of Others [Member]        
Schedule of Equity Method Investments [Line Items]        
Maximum borrowing capacity $ 318,000   $ 318,000  
Amount outstanding 204,900   204,900  
Unconsolidated Joint Ventures [Member] | Parent Company [Member] | Guarantee of Indebtedness of Others [Member]        
Schedule of Equity Method Investments [Line Items]        
Maximum guaranteed amount 36,000   36,000  
Guaranteed amount $ 24,600   $ 24,600  
Minimum [Member]        
Schedule of Equity Method Investments [Line Items]        
Percentage of interest in venture 12.50%   12.50%  
Maximum [Member]        
Schedule of Equity Method Investments [Line Items]        
Percentage of interest in venture 85.00%   85.00%  
Variable Interest Entity [Member]        
Schedule of Equity Method Investments [Line Items]        
Carrying Value $ 128,400   $ 128,400  
Number of VIEs | property 4   4