Annual report pursuant to Section 13 and 15(d)

Investments In Unconsolidated Joint Ventures (Narrative) (Details)

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Investments In Unconsolidated Joint Ventures (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
ft²
item
property
Dec. 31, 2018
USD ($)
item
Schedule of Equity Method Investments [Line Items]    
Carrying Value $ 209,091 $ 232,750
Number of units | item 208 1,317
Amount outstanding $ 329,000 $ 790,939
Management, leasing, development and other services fees 2,400 2,400
Accounts receivable due from unconsolidated joint ventures 600 200
Maximum exposure to loss 152,300  
Estimated future funding commitments 34,600  
Unconsolidated Joint Venture Other Property [Member]    
Schedule of Equity Method Investments [Line Items]    
Carrying Value $ 209,091 $ 232,750
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 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 7  
Number of units | item 2,611  
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 Land Parcels [Member]    
Schedule of Equity Method Investments [Line Items]    
Number of units | item 3,220  
Unconsolidated Joint Ventures [Member] | Guarantee of Indebtedness of Others [Member]    
Schedule of Equity Method Investments [Line Items]    
Maximum borrowing capacity $ 318,000  
Amount outstanding 233,400  
Unconsolidated Joint Ventures [Member] | Parent Company [Member] | Guarantee of Indebtedness of Others [Member]    
Schedule of Equity Method Investments [Line Items]    
Maximum borrowing capacity 34,600  
Amount outstanding $ 26,100  
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 $ 117,700  
Number of VIEs | property 3  
Variable Interest Entity [Member] | Unconsolidated Joint Venture Development Projects [Member]    
Schedule of Equity Method Investments [Line Items]    
Number of VIEs | property 1  
Variable Interest Entity [Member] | Unconsolidated Joint Venture Property [Member]    
Schedule of Equity Method Investments [Line Items]    
Number of VIEs | property 2