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
Mar. 31, 2021
USD ($)
ft²
property
item
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Schedule of Equity Method Investments [Line Items]      
Carrying Value $ 159,971   $ 162,382
Amount outstanding     25,000
Management, leasing, development and other services fees 300 $ 600  
Accounts receivable due from unconsolidated joint ventures 200   300
Maximum exposure to loss 142,000    
Estimated future funding commitments 33,900    
Unconsolidated Joint Venture Other Property [Member]      
Schedule of Equity Method Investments [Line Items]      
Carrying Value $ 159,971   $ 162,382
Unconsolidated Joint Venture Office Buildings [Member]      
Schedule of Equity Method Investments [Line Items]      
Number of properties | property 2    
Area of property (in square feet) | ft² 200,000    
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 278,100    
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 $ 30,600    
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 $ 108,000    
Number of VIEs | property 3