Quarterly report pursuant to Section 13 or 15(d)

Commitments And Contingencies (Joint Venture Interests Agreement And Other) (Narrative) (Details)

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Commitments And Contingencies (Joint Venture Interests Agreement And Other) (Narrative) (Details) (USD $)
 6 Months Ended 3 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Property Lock-Ups [Member]
property
Jun. 30, 2014
Property Lock-Ups Expired [Member]
property
Jun. 30, 2014
Wegmans Food Markets, Inc. [Member]
Jul. 31, 2012
Wegmans Food Markets, Inc. [Member]
sqft
Sep. 30, 2014
Overlook Ridge Properties [Member]
Scenario, Forecast [Member]
Sep. 30, 2014
Development Property [Member]
Overlook Ridge Properties [Member]
Scenario, Forecast [Member]
item
Jun. 30, 2014
Multi-Family Properties [Member]
item
Sep. 30, 2014
Multi-Family Properties [Member]
Overlook Ridge Properties [Member]
Scenario, Forecast [Member]
property
Commitments And Contingencies [Line Items]                    
Acquisition cost $ 38,948,000 $ 31,500,000         $ 16,600,000      
Percentage of interest in venture               100.00%   50.00%
Number of apartments               1,167 3,898  
Number of properties     7 115           2
Properties aggregate net book value     123,500,000 1,400,000,000            
Expiration year     2016              
Costs of the project incurred         6,400,000          
Delivery date to tenant         first quarter of 2015          
Area of property (in square feet)           140,000        
Total project costs         $ 15,700,000