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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]          
Investments in unconsolidated joint ventures $ 265,866,000   $ 265,866,000   $ 181,129,000
Management, leasing, development and other services fees 1,400,000 1,300,000 2,800,000 2,300,000  
Accounts receivable due from unconsolidated joint ventures 824,000   824,000   523,000
Maximum exposure to loss 110,800,000   110,800,000    
Estimated future funding commitments 16,300,000   16,300,000    
Unconsolidated Joint Venture Office Buildings [Member]
          
Schedule of Equity Method Investments [Line Items]          
Number of properties 29   29    
Unconsolidated Joint Venture Office And Retail Buildings [Member]
          
Schedule of Equity Method Investments [Line Items]          
Area of property (in square feet) 4,700,000   4,700,000    
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 7   7    
Number of units 2,597   2,597    
Unconsolidated Joint Venture Hotel [Member]
          
Schedule of Equity Method Investments [Line Items]          
Number of units 350   350    
Unconsolidated Joint Venture Commercial Property [Member]
          
Schedule of Equity Method Investments [Line Items]          
Area of property (in square feet) 1,700,000   1,700,000    
Unconsolidated Joint Venture Development Projects [Member]
          
Schedule of Equity Method Investments [Line Items]          
Number of units 3,317   3,317    
Unconsolidated Joint Venture Land Parcels [Member]
          
Schedule of Equity Method Investments [Line Items]          
Number of units 4,130   4,130    
Unconsolidated Joint Ventures [Member]
          
Schedule of Equity Method Investments [Line Items]          
Maximum borrowing capacity 311,100,000   311,100,000    
Amount outstanding 200,600,000   200,600,000    
Unconsolidated Joint Ventures [Member] | Parent Company [Member]
          
Schedule of Equity Method Investments [Line Items]          
Maximum borrowing capacity 89,900,000   89,900,000    
Amount outstanding 79,800,000   79,800,000    
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 94,500,000   94,500,000    
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) 1,500,000   1,500,000    
South Pier At Harborside [Member]
          
Schedule of Equity Method Investments [Line Items]          
Investments in unconsolidated joint ventures    [1]      [1]      [1]
Number of units 350   350    
Percentage of interest in venture 50.00% [2]   50.00% [2]    
Letter of credit $ 4,600,000   $ 4,600,000    
[1] The negative investment balance for this joint venture of $710 and $1,706 as of June 30, 2014 and December 31, 2013, respectively, were included in accounts payable, accrued expenses and other liabilities.
[2] Company's effective ownership % represents the Company's entitlement to residual distributions after payments of priority returns, where applicable.