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
 3 Months Ended 6 Months Ended 9 Months Ended
Oct. 06, 2015
USD ($)
item
Apr. 01, 2015
USD ($)
item
Sep. 30, 2015
USD ($)
ft²
property
item
Sep. 30, 2015
USD ($)
ft²
property
item
Sep. 30, 2015
USD ($)
ft²
property
item
Sep. 30, 2014
USD ($)
Dec. 31, 2017
item
Commitments And Contingencies [Line Items]              
Amount outstanding     $ 35,000 $ 35,000 $ 35,000    
Investment in unconsolidated joint ventures         68,468 $ 57,568  
Development of rental property         49,959 4,881  
Purchase price of property         $ 59,700 $ 77,109  
Eastchester Project [Member]              
Commitments And Contingencies [Line Items]              
Percentage of interest in venture     76.25% 76.25% 76.25%    
Costs of the project incurred         $ 13,500    
Delivery date to tenant         second quarter of 2016    
Number of units | item     108 108 108    
Project costs incurred to date     $ 22,700 $ 22,700 $ 22,700    
Amount of project costs funded by members     20,900 20,900 20,900    
Total project costs         50,000    
Amount to fund     7,400 7,400 7,400    
City Square Project [Member]              
Commitments And Contingencies [Line Items]              
Costs of the project incurred       7,100 7,100    
Number of units | item   365          
Total project costs     92,500   92,500    
Purchase price of property   $ 3,100          
Contingent consideration   $ 1,250          
Amount to fund     $ 85,400 $ 85,400 $ 85,400    
City Square Project Phase One [Member]              
Commitments And Contingencies [Line Items]              
Number of units | item     237 237 237    
City Square Project Phase Two [Member] | Scenario, Forecast [Member]              
Commitments And Contingencies [Line Items]              
Number of units | item             128
Property Lock-Ups [Member]              
Commitments And Contingencies [Line Items]              
Number of properties | property     7 7 7    
Properties aggregate net book value         $ 57,300    
Expiration year         2016    
Property Lock-Ups Expired [Member]              
Commitments And Contingencies [Line Items]              
Number of properties | property     110 110 110    
Properties aggregate net book value         $ 1,300,000    
150 Main Street, L.L.C. [Member] | Construction Loan [Member] | Eastchester Project [Member]              
Commitments And Contingencies [Line Items]              
Maximum borrowing capacity     $ 28,800 $ 28,800 28,800    
Amount outstanding     $ 6,600 $ 6,600 6,600    
Wegmans Food Markets, Inc. [Member]              
Commitments And Contingencies [Line Items]              
Costs of the project incurred         $ 13,900    
Delivery date to tenant         first quarter of 2017    
Total project costs         $ 28,700    
Area Of Real Estate Property | ft²     140,000 140,000 140,000    
Amount to fund     $ 14,800 $ 14,800 $ 14,800    
Development Property [Member] | Chase II Project [Member]              
Commitments And Contingencies [Line Items]              
Costs of the project incurred         $ 12,400    
Number of units | item     1,034 1,034 1,034    
Total project costs         $ 74,400    
Amount to fund     $ 62,000 $ 62,000 $ 62,000    
Development Property [Member] | Chase II Project, Initial Phase [Member]              
Commitments And Contingencies [Line Items]              
Number of units | item     292 292 292    
Unconsolidated Joint Venture Hotel [Member]              
Commitments And Contingencies [Line Items]              
Number of units | item     350 350 350    
Subsequent Event [Member] | Unconsolidated Joint Venture Hotel [Member]              
Commitments And Contingencies [Line Items]              
Percentage of interest in venture 90.00%            
Cash consideration $ 27,300            
Capital credit 23,700            
Amount to fund $ 4,800            
Subsequent Event [Member] | Unconsolidated Joint Venture Hotel [Member] | XS Port Imperial Hotel, LLC [Member]              
Commitments And Contingencies [Line Items]              
Number of units | item 364            
Ownership percentage of third party venture 10.00%            
Subsequent Event [Member] | Unconsolidated Joint Venture Hotel [Member] | Port Imperial Hotel [Member]              
Commitments And Contingencies [Line Items]              
Total project costs $ 129,600            
Subsequent Event [Member] | Unconsolidated Joint Venture Hotel [Member] | XS Hotel [Member]              
Commitments And Contingencies [Line Items]              
Cash consideration 3,000            
Subsequent Event [Member] | Unconsolidated Joint Venture Hotel [Member] | Construction Loan [Member] | Port Imperial Hotel [Member]              
Commitments And Contingencies [Line Items]              
Amount to fund $ 94,000