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, 2020
USD ($)
Jun. 30, 2021
USD ($)
ft²
property
item
Dec. 31, 2020
USD ($)
Schedule of Equity Method Investments [Line Items]      
Carrying Value   $ 154,914 $ 162,382
Amount outstanding   189,000 25,000
Management, leasing, development and other services fees $ 600 1,800  
Accounts receivable due from unconsolidated joint ventures   300 300
Maximum exposure to loss   139,800  
Estimated future funding commitments   34,000  
Unconsolidated Joint Venture Other Property [Member]      
Schedule of Equity Method Investments [Line Items]      
Carrying Value   $ 154,914 $ 162,382
Unconsolidated Joint Venture Office Buildings [Member]      
Schedule of Equity Method Investments [Line Items]      
Number of properties | property   1  
Area of property (in square feet) | ft²   100,000  
Unconsolidated Joint Venture Retail Buildings [Member]      
Schedule of Equity Method Investments [Line Items]      
Number of properties | property   1  
Area of mixed use project (in square feet) | ft²   51,000  
Unconsolidated Joint Venture Multi-Family Properties [Member]      
Schedule of Equity Method Investments [Line Items]      
Number of properties | property   6  
Number of units | item   1,786  
Unconsolidated Joint Venture Hotel [Member]      
Schedule of Equity Method Investments [Line Items]      
Number of units | item   351  
Unconsolidated Joint Venture Development Projects [Member]      
Schedule of Equity Method Investments [Line Items]      
Number of units | item   360  
Unconsolidated Joint Venture Development Projects [Member] | Variable Interest Entity, Primary Beneficiary [Member]      
Schedule of Equity Method Investments [Line Items]      
Number of VIEs | property   1  
Unconsolidated Joint Venture Land Parcels [Member]      
Schedule of Equity Method Investments [Line Items]      
Number of units | item   1,621  
Unconsolidated Joint Ventures [Member] | Guarantee of Indebtedness of Others [Member]      
Schedule of Equity Method Investments [Line Items]      
Maximum borrowing capacity   $ 304,000  
Amount outstanding   288,400  
Unconsolidated Joint Ventures [Member] | Parent Company [Member] | Guarantee of Indebtedness of Others [Member]      
Schedule of Equity Method Investments [Line Items]      
Maximum guaranteed amount   33,200  
Guaranteed amount   $ 31,600  
Unconsolidated Joint Venture Property [Member] | Variable Interest Entity, Primary Beneficiary [Member]      
Schedule of Equity Method Investments [Line Items]      
Number of VIEs | property   2  
Minimum [Member]      
Schedule of Equity Method Investments [Line Items]      
Percentage of interest in venture   20.00%  
Maximum [Member]      
Schedule of Equity Method Investments [Line Items]      
Percentage of interest in venture   85.00%  
Variable Interest Entity [Member]      
Schedule of Equity Method Investments [Line Items]      
Carrying Value   $ 105,800  
Number of VIEs | property   3