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 6 Months Ended
Jun. 30, 2018
USD ($)
ft²
property
item
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
ft²
property
item
Dec. 31, 2017
USD ($)
Schedule of Equity Method Investments [Line Items]        
Carrying Value $ 247,607   $ 247,607 $ 252,626
Number of units | item 858   858  
Area of mixed use project (in square feet) | ft²     81,700  
Amount outstanding $ 856,188   $ 856,188 822,288
Management, leasing, development and other services fees 600 $ 700    
Accounts receivable due from unconsolidated joint ventures 600   600 $ 700
Maximum exposure to loss 163,500   163,500  
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  
Unconsolidated Joint Venture Office And Retail Buildings [Member]        
Schedule of Equity Method Investments [Line Items]        
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  
Unconsolidated Joint Venture Multi-Family Properties [Member]        
Schedule of Equity Method Investments [Line Items]        
Number of properties | property 9   9  
Number of units | item 3,334   3,334  
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 204,800   204,800  
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 $ 127,700   $ 127,700  
Number of VIEs | property 4   4