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) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]          
Investments in unconsolidated joint ventures $ 239,767,000   $ 239,767,000   $ 181,129,000
Percentage of interest in venture    [1]      [1]    
Management, leasing, development and other services fees 1,900,000 1,700,000 5,100,000 4,200,000  
Accounts receivable due from unconsolidated joint ventures 899,000   899,000   523,000
Maximum exposure to loss 207,400,000   207,400,000    
Estimated future funding commitments 110,700,000   110,700,000    
Unconsolidated Joint Venture Office Buildings [Member]
          
Schedule of Equity Method Investments [Line Items]          
Number of properties 36   36    
Unconsolidated Joint Venture Office And Retail Buildings [Member]
          
Schedule of Equity Method Investments [Line Items]          
Area of property (in square feet) 5,700,000   5,700,000    
Unconsolidated Joint Venture Retail Buildings [Member]
          
Schedule of Equity Method Investments [Line Items]          
Number of properties 2   2    
Unconsolidated Joint Venture Multi-Family Properties [Member]
          
Schedule of Equity Method Investments [Line Items]          
Number of properties 10   10    
Number of units 3,639   3,639    
Unconsolidated Joint Venture Hotel [Member]
          
Schedule of Equity Method Investments [Line Items]          
Number of units 350   350    
Unconsolidated Joint Venture Development Projects [Member]
          
Schedule of Equity Method Investments [Line Items]          
Number of units 2,275   2,275    
Unconsolidated Joint Venture Land Parcels [Member]
          
Schedule of Equity Method Investments [Line Items]          
Number of units 2,994   2,994    
Unconsolidated Joint Ventures [Member]
          
Schedule of Equity Method Investments [Line Items]          
Maximum borrowing capacity 287,900,000   287,900,000    
Amount outstanding 215,500,000   215,500,000    
Unconsolidated Joint Ventures [Member] | Parent Company [Member]
          
Schedule of Equity Method Investments [Line Items]          
Maximum borrowing capacity 71,500,000   71,500,000    
Amount outstanding 62,600,000   62,600,000    
Minimum [Member]
          
Schedule of Equity Method Investments [Line Items]          
Percentage of interest in venture 7.50%   7.50%    
Maximum [Member]
          
Schedule of Equity Method Investments [Line Items]          
Percentage of interest in venture 85.00%   85.00%    
Variable Interest Entity [Member]
          
Schedule of Equity Method Investments [Line Items]          
Investments in unconsolidated joint ventures 96,700,000   96,700,000    
Number of VIEs 8   8    
Office [Member] | Unconsolidated Joint Venture Land Parcels [Member]
          
Schedule of Equity Method Investments [Line Items]          
Area of property (in square feet) 1,400,000   1,400,000    
South Pier At Harborside [Member]
          
Schedule of Equity Method Investments [Line Items]          
Investments in unconsolidated joint ventures    [2]      [2]      [2]
Number of units 350   350    
Percentage of interest in venture 50.00% [1]   50.00% [1]    
Letter of credit $ 4,100,000   $ 4,100,000    
[1] Company's effective ownership % represents the Company's entitlement to residual distributions after payments of priority returns, where applicable.
[2] The negative investment balance for this joint venture of $2,582 and $1,706 as of September 30, 2014 and December 31, 2013, respectively, were included in accounts payable, accrued expenses and other liabilities.