Annual report pursuant to Section 13 and 15(d)

Investments In Unconsolidated Joint Ventures (Narrative) (Details)

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Investments In Unconsolidated Joint Ventures (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Unconsolidated Joint Venture Office Buildings [Member]
property
Dec. 31, 2012
Unconsolidated Joint Venture Retail Buildings [Member]
sqft
property
Dec. 31, 2012
Unconsolidated Joint Venture Multi-Family Properties [Member]
item
property
Dec. 31, 2012
Unconsolidated Joint Venture Hotel [Member]
item
Dec. 31, 2012
Unconsolidated Joint Venture Commercial Property [Member]
sqft
Dec. 31, 2012
Unconsolidated Joint Venture Development Projects [Member]
item
Dec. 31, 2012
Unconsolidated Joint Venture Land Parcels [Member]
sqft
item
Dec. 31, 2012
Minimum [Member]
Dec. 31, 2012
Maximum [Member]
Dec. 31, 2012
Variable Interest Entity [Member]
property
Schedule of Equity Method Investments [Line Items]                        
Investments in unconsolidated joint ventures $ 132,339,000 $ 32,015,000                   $ 13,600,000
Number of properties     4 2 6              
Area of property (in square feet)       500,000     1,700,000   1,200,000      
Number of units         1,769 350   2,376 3,776      
Area of mixed use project (in square feet)                 1,500,000      
Percentage of interest in venture                   7.50% 80.00%  
Accounts receivable from unconsolidated joint ventures 370,000                      
Number of VIEs                       6
Maximum exposure to loss 17,500,000                      
Estimated future funding commitments $ 3,900,000