Annual report pursuant to Section 13 and 15(d)

Investments In Unconsolidated Joint Ventures (Narrative) (Details)

v3.6.0.2
Investments In Unconsolidated Joint Ventures (Narrative) (Details)
$ in Thousands
 12 Months Ended
Sep. 13, 2016
USD ($)
Dec. 31, 2016
USD ($)
ft²
property
item
Dec. 31, 2015
USD ($)
Schedule of Equity Method Investments [Line Items]      
Company's net investment in unconsolidated joint ventures   $ 320,047 $ 303,457
Area of mixed use project (in square feet) | ft²   81,700  
Amount outstanding   $ 634,069 155,000
Management, leasing, development and other services fees   3,700 5,500
Accounts receivable due from unconsolidated joint ventures   700 800
Maximum exposure to loss   207,400  
Estimated future funding commitments   22,000  
Property Debt, Balance     59,700
Issuance of loan   17,800  
Accounts payable, accrued expenses and other liabilities   $ 159,874 $ 135,057
Unconsolidated Joint Venture Office Buildings [Member]      
Schedule of Equity Method Investments [Line Items]      
Number of properties | property   36  
Unconsolidated Joint Venture Office And Retail Buildings [Member]      
Schedule of Equity Method Investments [Line Items]      
Area of property (in square feet) | ft²   5,600,000  
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   10  
Number of units | item   3,587  
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   822  
Unconsolidated Joint Venture Land Parcels [Member]      
Schedule of Equity Method Investments [Line Items]      
Number of units | item   4,151  
Unconsolidated Joint Ventures [Member]      
Schedule of Equity Method Investments [Line Items]      
Maximum borrowing capacity   $ 192,000  
Amount outstanding   155,200  
Unconsolidated Joint Ventures [Member] | Parent Company [Member]      
Schedule of Equity Method Investments [Line Items]      
Maximum borrowing capacity   22,000  
Amount outstanding   $ 22,000  
Minimum [Member]      
Schedule of Equity Method Investments [Line Items]      
Percentage of interest in venture   7.50%  
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   $ 185,400  
Number of VIEs | property   4  
South Pier At Harborside [Member]      
Schedule of Equity Method Investments [Line Items]      
Letter of credit $ 3,000    
Property Debt, Balance $ 59,100 $ 100,000  
Property Debt, Interest Rate 6.15% 3.668%  
Mortgage loan, maturity date Nov. 01, 2016 Oct. 01, 2026  
Issuance of loan   $ 35,700  
Accounts payable, accrued expenses and other liabilities   $ 3,317