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, 2017
USD ($)
ft²
property
item
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Schedule of Equity Method Investments [Line Items]      
Company's net investment in unconsolidated joint ventures $ 325,150   $ 320,047
Area of mixed use project (in square feet) | ft² 81,700    
Amount outstanding $ 760,937   634,069
Management, leasing, development and other services fees 700 $ 3,700  
Accounts receivable due from unconsolidated joint ventures 700   $ 700
Maximum exposure to loss 214,100    
Estimated future funding commitments $ 24,800    
Unconsolidated Joint Venture Office Buildings [Member]      
Schedule of Equity Method Investments [Line Items]      
Number of properties | property 5    
Unconsolidated Joint Venture Office And Retail Buildings [Member]      
Schedule of Equity Method Investments [Line Items]      
Area of property (in square feet) | ft² 1,400,000    
Unconsolidated Joint Venture Retail Buildings [Member]      
Schedule of Equity Method Investments [Line Items]      
Number of properties | property 2    
Unconsolidated Joint Venture Multi-Family Properties [Member]      
Schedule of Equity Method Investments [Line Items]      
Number of properties | property 8    
Number of units | item 3,005    
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 821    
Unconsolidated Joint Venture Land Parcels [Member]      
Schedule of Equity Method Investments [Line Items]      
Number of units | item 4,351    
Unconsolidated Joint Ventures [Member] | Guarantee of Indebtedness of Others [Member]      
Schedule of Equity Method Investments [Line Items]      
Maximum borrowing capacity $ 206,000    
Amount outstanding 176,000    
Unconsolidated Joint Ventures [Member] | Parent Company [Member] | Guarantee of Indebtedness of Others [Member]      
Schedule of Equity Method Investments [Line Items]      
Maximum guaranteed amount 24,800    
Guaranteed amount $ 22,400    
Minimum [Member]      
Schedule of Equity Method Investments [Line Items]      
Percentage of interest in venture 12.50%    
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]      
Company's net investment in unconsolidated joint ventures $ 189,300    
Number of VIEs | property 4