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 $)
Mar. 31, 2014
Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]    
Investments in unconsolidated joint ventures $ 179,656,000 $ 181,129,000
Accounts receivable due from unconsolidated joint ventures 504,000 523,000
Maximum exposure to loss 18,200,000  
Estimated future funding commitments 8,800,000  
Unconsolidated Joint Venture Office Buildings [Member]
    
Schedule of Equity Method Investments [Line Items]    
Number of properties 21  
Unconsolidated Joint Venture Office And Retail Buildings [Member]
    
Schedule of Equity Method Investments [Line Items]    
Area of property (in square feet) 2,600,000  
Unconsolidated Joint Venture Retail Buildings [Member]
    
Schedule of Equity Method Investments [Line Items]    
Number of properties 2  
Unconsolidated Joint Venture Multi-Family Properties [Member]
    
Schedule of Equity Method Investments [Line Items]    
Number of properties 7  
Number of units 2,597  
Unconsolidated Joint Venture Hotel [Member]
    
Schedule of Equity Method Investments [Line Items]    
Number of units 350  
Unconsolidated Joint Venture Commercial Property [Member]
    
Schedule of Equity Method Investments [Line Items]    
Area of property (in square feet) 1,700,000  
Unconsolidated Joint Venture Development Projects [Member]
    
Schedule of Equity Method Investments [Line Items]    
Number of units 2,976  
Unconsolidated Joint Venture Land Parcels [Member]
    
Schedule of Equity Method Investments [Line Items]    
Number of units 3,708  
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 80.00%  
Variable Interest Entity [Member]
    
Schedule of Equity Method Investments [Line Items]    
Investments in unconsolidated joint ventures $ 9,400,000  
Number of VIEs 6  
Office [Member] | Unconsolidated Joint Venture Land Parcels [Member]
    
Schedule of Equity Method Investments [Line Items]    
Area of property (in square feet) 1,200,000