Annual report pursuant to Section 13 and 15(d)

Investments In Unconsolidated Joint Ventures (Narrative) (Details)

v3.10.0.1
Investments In Unconsolidated Joint Ventures (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
ft²
property
item
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Schedule of Equity Method Investments [Line Items]      
Carrying Value $ 232,750 $ 252,626  
Number of units | item 1,317    
Amount outstanding $ 790,939 822,288  
Management, leasing, development and other services fees 2,400 2,800  
Accounts receivable due from unconsolidated joint ventures 200 800  
Maximum exposure to loss 165,400    
Estimated future funding commitments 35,800    
Mortgage Loans on Real Estate $ 45,242 $ 45,734
Unconsolidated Joint Venture Office Buildings [Member]      
Schedule of Equity Method Investments [Line Items]      
Number of properties | property 4    
Area of property (in square feet) | ft² 500,000    
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 8    
Number of units | item 2,922    
Unconsolidated Joint Venture Hotel [Member]      
Schedule of Equity Method Investments [Line Items]      
Number of units | item 350    
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 3,738    
Unconsolidated Joint Ventures [Member] | Guarantee of Indebtedness of Others [Member]      
Schedule of Equity Method Investments [Line Items]      
Maximum borrowing capacity $ 316,900    
Amount outstanding 204,900    
Unconsolidated Joint Ventures [Member] | Parent Company [Member] | Guarantee of Indebtedness of Others [Member]      
Schedule of Equity Method Investments [Line Items]      
Maximum borrowing capacity 35,800    
Amount outstanding $ 24,600    
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 $ 129,500    
Number of VIEs | property 4