Quarterly report pursuant to Section 13 or 15(d)

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

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Commitments And Contingencies (Construction Projects) (Narrative) (Details)
 6 Months Ended 15 Months Ended
Oct. 06, 2015
USD ($)
item
Apr. 01, 2015
USD ($)
Jun. 30, 2016
USD ($)
item
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
Sep. 30, 2015
item
Commitments And Contingencies [Line Items]              
Amount outstanding     $ 75,000,000   $ 75,000,000 $ 155,000,000  
Investment in unconsolidated joint ventures     23,657,000 $ 49,305,000      
Development of rental property     77,386,000 27,869,000      
Purchase price of property     $ 51,638,000 $ 42,881,000      
Eastchester Project [Member]              
Commitments And Contingencies [Line Items]              
Percentage of interest in venture     76.25%   76.25%    
Costs of the project incurred     $ 17,400,000        
Delivery date to tenant     third quarter of 2016        
Number of units | item     108   108    
Project costs incurred to date     $ 43,100,000   $ 43,100,000    
Amount of project costs funded by members     22,800,000   22,800,000    
Total project costs     51,800,000        
Amount to fund     5,400,000   5,400,000    
City Square Project [Member]              
Commitments And Contingencies [Line Items]              
Costs of the project incurred         18,500,000    
Total project costs     92,500,000        
Purchase price of property   $ 3,100,000          
Contingent consideration   $ 1,250,000          
Amount to fund     $ 32,500,000   $ 32,500,000    
City Square Project Phase One [Member]              
Commitments And Contingencies [Line Items]              
Delivery date to tenant     fourth quarter 2017        
Number of units | item             237
Signature Place Project [Member]              
Commitments And Contingencies [Line Items]              
Costs of the project incurred     $ 7,100,000        
Delivery date to tenant     fourth quarter of 2017        
Number of units | item     197   197    
Project costs incurred to date     $ 7,700,000   $ 7,700,000    
Total project costs     58,700,000        
Amount to fund     7,700,000   $ 7,700,000    
Portside 5/6 Project [Member]              
Commitments And Contingencies [Line Items]              
Costs of the project incurred     $ 11,200,000        
Delivery date to tenant     first quarter of 2018        
Number of units | item     296   296    
Project costs incurred to date     $ 15,300,000   $ 15,300,000    
Total project costs     112,000,000.000000        
Riverhouse 11 Project [Member]              
Commitments And Contingencies [Line Items]              
Costs of the project incurred     24,700,000        
Total project costs     47,000,000        
Construction Loan [Member] | Eastchester Project [Member]              
Commitments And Contingencies [Line Items]              
Maximum borrowing capacity     28,800,000   28,800,000    
Amount outstanding     20,900,000   20,900,000    
Construction Loan [Member] | City Square Project [Member]              
Commitments And Contingencies [Line Items]              
Maximum borrowing capacity     41,500,000   41,500,000    
Amount outstanding     0   0    
Construction Loan [Member] | Signature Place Project [Member]              
Commitments And Contingencies [Line Items]              
Amount to fund     42,000,000   42,000,000    
Construction Loan [Member] | Riverhouse 11 Project [Member]              
Commitments And Contingencies [Line Items]              
Amount to fund     78,000,000   78,000,000    
Development Property [Member] | Signature Place Project [Member]              
Commitments And Contingencies [Line Items]              
Amount to fund     16,700,000   16,700,000    
Development Property [Member] | Portside 5/6 Project [Member]              
Commitments And Contingencies [Line Items]              
Amount to fund     15,300,000   $ 15,300,000    
Development Property [Member] | Chase II Project [Member]              
Commitments And Contingencies [Line Items]              
Costs of the project incurred     $ 26,900,000        
Delivery date to tenant     fourth quarter of 2016        
Number of units | item     1,034   1,034    
Total project costs     $ 74,900,000        
Amount to fund     $ 0   $ 0    
Development Property [Member] | Chase II Project, Initial Phase [Member]              
Commitments And Contingencies [Line Items]              
Number of units | item             292
Development Property [Member] | Riverhouse 11 Project [Member]              
Commitments And Contingencies [Line Items]              
Delivery date to tenant     first quarter 2018        
Number of units | item     295   295    
Project costs incurred to date     $ 28,000,000   $ 28,000,000    
Total project costs     125,000,000        
Development Property [Member] | Construction Loan [Member] | Chase II Project [Member]              
Commitments And Contingencies [Line Items]              
Maximum borrowing capacity     48,000,000   48,000,000    
Amount outstanding     8,700,000   $ 8,700,000    
Unconsolidated Joint Venture Hotel [Member]              
Commitments And Contingencies [Line Items]              
Percentage of interest in venture 90.00%            
Development costs     $ 8,400,000        
Number of units | item     350   350    
Amount to fund     $ 0   $ 0    
Unconsolidated Joint Venture Hotel [Member] | Portside 5/6 Project [Member]              
Commitments And Contingencies [Line Items]              
Amount to fund     39,000,000   39,000,000    
Unconsolidated Joint Venture Hotel [Member] | XS Port Imperial Hotel, LLC [Member]              
Commitments And Contingencies [Line Items]              
Number of units | item 372            
Ownership percentage of third party venture 10.00%            
Unconsolidated Joint Venture Hotel [Member] | Port Imperial Hotel [Member]              
Commitments And Contingencies [Line Items]              
Total project costs $ 105,900,000            
Unconsolidated Joint Venture Hotel [Member] | Construction Loan [Member] | Portside 5/6 Project [Member]              
Commitments And Contingencies [Line Items]              
Amount to fund     73,000,000   73,000,000    
Unconsolidated Joint Venture Hotel [Member] | Construction Loan [Member] | Port Imperial Hotel [Member]              
Commitments And Contingencies [Line Items]              
Amount outstanding     $ 3,100,000   $ 3,100,000    
Amount to fund $ 94,000,000