Quarterly report pursuant to Section 13 or 15(d)

Investments In Unconsolidated Joint Ventures (Narrative) (Details)

v3.7.0.1
Investments In Unconsolidated Joint Ventures (Narrative) (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
ft²
property
item
Dec. 31, 2016
USD ($)
Schedule of Equity Method Investments [Line Items]      
Company's net investment in unconsolidated joint ventures   $ 315,110 $ 320,047
Area of mixed use project (in square feet) | ft²   81,700  
Amount outstanding   $ 770,388 634,069
Management, leasing, development and other services fees $ 3,700 700  
Accounts receivable due from unconsolidated joint ventures   700 $ 700
Maximum exposure to loss   212,700  
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   3,275  
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   4,348  
Unconsolidated Joint Ventures [Member] | Guarantee of Indebtedness of Others [Member]      
Schedule of Equity Method Investments [Line Items]      
Maximum borrowing capacity   $ 206,000  
Amount outstanding   189,500  
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   $ 22,700  
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   $ 187,900  
Number of VIEs | property   4