Annual report pursuant to Section 13 and 15(d)

Commitments And Contingencies (Construction Projects) (Narrative) (Details)

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Commitments And Contingencies (Construction Projects) (Narrative) (Details)
 12 Months Ended
Oct. 06, 2015
USD ($)
item
Apr. 01, 2015
USD ($)
Aug. 15, 2014
USD ($)
Dec. 31, 2015
USD ($)
item
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 10, 2015
USD ($)
Commitments And Contingencies [Line Items]              
Amount outstanding       $ 155,000,000 $ 0    
Investment in unconsolidated joint ventures       78,027,000 67,325,000 $ 86,504,000  
Development of rental property       81,073,000 25,140,000 13,772,000  
Purchase price of property       $ 94,073,000 $ 91,813,000 $ 89,869,000  
Eastchester Project [Member]              
Commitments And Contingencies [Line Items]              
Percentage of interest in venture       76.25%      
Number of properties | item       108      
Costs of the project incurred       $ 14,700,000      
Delivery date to tenant       second quarter of 2016      
Project costs incurred to date       $ 29,600,000      
Amount of project costs funded by members       20,900,000      
Total project costs       50,000,000      
Amount to fund       6,200,000      
City Square Project [Member]              
Commitments And Contingencies [Line Items]              
Costs of the project incurred       9,100,000      
Total project costs       92,500,000      
Purchase price of property   $ 3,100,000          
Contingent consideration   $ 1,250,000          
Amount to fund       $ 41,900,000      
City Square Project Phase One [Member]              
Commitments And Contingencies [Line Items]              
Delivery date to tenant       second quarter 2017      
Number of units | item       237      
City Square Project Phase Two [Member]              
Commitments And Contingencies [Line Items]              
Number of units | item       128      
Construction Loan [Member] | City Square Project [Member]              
Commitments And Contingencies [Line Items]              
Maximum borrowing capacity       $ 0     $ 41,500,000
150 Main Street, L.L.C. [Member] | Construction Loan [Member] | Eastchester Project [Member]              
Commitments And Contingencies [Line Items]              
Maximum borrowing capacity       28,800,000      
Amount outstanding       10,900,000      
Overlook Ridge Properties [Member]              
Commitments And Contingencies [Line Items]              
Purchase price of property     $ 16,600,000        
Development Property [Member]              
Commitments And Contingencies [Line Items]              
Amount to fund $ 3,300,000            
Development Property [Member] | Chase II Project [Member]              
Commitments And Contingencies [Line Items]              
Costs of the project incurred       $ 22,100,000      
Delivery date to tenant       second quarter 2017      
Number of units | item       1,034      
Total project costs       $ 74,900,000      
Amount to fund       $ 4,800,000      
Development Property [Member] | Chase II Project, Initial Phase [Member]              
Commitments And Contingencies [Line Items]              
Number of units | item       292      
Development Property [Member] | Construction Loan [Member] | Chase II Project [Member]              
Commitments And Contingencies [Line Items]              
Maximum borrowing capacity       $ 48,000,000      
Amount outstanding       $ 0      
Unconsolidated Joint Venture Hotel [Member]              
Commitments And Contingencies [Line Items]              
Percentage of interest in venture 90.00%            
Costs of the project incurred $ 1,500,000            
Number of units | item       350      
Cash consideration 27,300,000            
Capital credit $ 23,700,000            
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%            
Total project costs $ 105,900,000            
Unconsolidated Joint Venture Hotel [Member] | XS Hotel [Member]              
Commitments And Contingencies [Line Items]              
Cash consideration 3,000,000            
Unconsolidated Joint Venture Hotel [Member] | Construction Loan [Member] | Port Imperial Hotel [Member]              
Commitments And Contingencies [Line Items]              
Amount to fund $ 94,000,000