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 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
ft²
property
item
Dec. 31, 2016
USD ($)
Schedule of Equity Method Investments [Line Items]      
Company's net investment in unconsolidated joint ventures   $ 238,440 $ 320,047
Area of mixed use project (in square feet) | ft²   81,700  
Amount outstanding   $ 671,838 634,069
Management, leasing, development and other services fees $ 900 600  
Accounts receivable due from unconsolidated joint ventures   700 $ 700
Maximum exposure to loss   139,000  
Estimated future funding commitments   $ 24,800  
Unconsolidated Joint Venture Office Buildings [Member]      
Schedule of Equity Method Investments [Line Items]      
Number of properties | property   4  
Unconsolidated Joint Venture Office And Retail Buildings [Member]      
Schedule of Equity Method Investments [Line Items]      
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  
Unconsolidated Joint Venture Multi-Family Properties [Member]      
Schedule of Equity Method Investments [Line Items]      
Number of properties | property   8  
Number of units | item   3,275  
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   59  
Unconsolidated Joint Venture Land Parcels [Member]      
Schedule of Equity Method Investments [Line Items]      
Number of units | item   3,998  
Unconsolidated Joint Ventures [Member] | Guarantee of Indebtedness of Others [Member]      
Schedule of Equity Method Investments [Line Items]      
Maximum borrowing capacity   $ 206,000  
Amount outstanding   194,200  
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   $ 23,300  
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   $ 114,200  
Number of VIEs | property   3