Quarterly report pursuant to Section 13 or 15(d)

Commitments And Contingencies (Other) (Narrative) (Details)

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Commitments And Contingencies (Other) (Narrative) (Details)
$ in Thousands
 6 Months Ended
Apr. 01, 2015
USD ($)
item
Jun. 30, 2015
USD ($)
ft²
property
item
Jun. 30, 2014
USD ($)
Aug. 01, 2014
Commitments And Contingencies [Line Items]        
Investment in unconsolidated joint ventures   $ 49,305 $ 38,948  
Development of rental property   27,869 7,896  
Purchase price of property   $ 42,881 $ 41,825  
Eastchester Project [Member]        
Commitments And Contingencies [Line Items]        
Percentage of interest in venture   76.25%    
Delivery date to tenant   second quarter of 2016    
Number of units | item   108    
Project costs incurred to date   $ 18,400    
Amount of project costs funded by members   8,200    
Total project costs   $ 50,000    
City Square Project [Member]        
Commitments And Contingencies [Line Items]        
Number of units | item 365      
Total project costs $ 91,400      
Purchase price of property 3,100      
Contingent consideration $ 1,250      
Minimum project start period 12 months 12 months    
Property Lock-Ups [Member]        
Commitments And Contingencies [Line Items]        
Number of properties | property   7    
Properties aggregate net book value   $ 124,300    
Expiration year   2016    
Property Lock-Ups Expired [Member]        
Commitments And Contingencies [Line Items]        
Number of properties | property   110    
Properties aggregate net book value   $ 1,300,000    
Harborside Unit A Urban Renewal, LLC [Member]        
Commitments And Contingencies [Line Items]        
Percentage of interest in venture [1]   85.00%    
Development costs   $ 128,400    
Delivery date to tenant   fourth quarter of 2016    
Number of units | item   763    
Amount outstanding   $ 0    
Interest rate   5.197% [2]   5.197%
Mortgage Loan Maturity Date   Aug. 01, 2029    
Total project costs   $ 320,000    
Harborside Unit A Urban Renewal, LLC [Member] | Construction/Permanent Loan [Member]        
Commitments And Contingencies [Line Items]        
Maximum borrowing capacity   $ 192,000    
Mortgage Loan Maturity Date   Aug. 01, 2029    
Harborside Unit A Urban Renewal, LLC [Member] | Parent Company [Member]        
Commitments And Contingencies [Line Items]        
Total project costs   $ 17,400    
150 Main Street, L.L.C. [Member] | Construction Loan [Member] | Eastchester Project [Member]        
Commitments And Contingencies [Line Items]        
Maximum borrowing capacity   28,800    
Amount outstanding   3,500    
Wegmans Food Markets, Inc. [Member]        
Commitments And Contingencies [Line Items]        
Costs of the project incurred   $ 11,500    
Delivery date to tenant   first quarter of 2017    
Total project costs   $ 28,700    
Area of property (in square feet) | ft²   140,000    
[1] Company's effective ownership % represents the Company's entitlement to residual distributions after payments of priority returns, where applicable.
[2] The construction/permanent loan has a maximum borrowing amount of $192,000.