Quarterly report pursuant to Section 13 or 15(d)

Recent Transactions (Consolidations) (Narrative) (Details)

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Recent Transactions (Consolidations) (Narrative) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Jul. 08, 2016
USD ($)
Jan. 19, 2016
USD ($)
Jan. 05, 2016
USD ($)
item
Jun. 30, 2016
USD ($)
item
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Real Estate Properties [Line Items]            
Purchase price of property         $ 94,017 $ 59,700
Gain on change of control of interests         15,347  
Gain on sale of investment in unconsolidated joint venture         5,670 $ 6,448
Overlook Ridge Apartments Investors, L.L.C. [Member]            
Real Estate Properties [Line Items]            
Percentage of interest in venture     50.00%      
Number of units | item     371      
Purchase price of property     $ 39,800      
Loans assumed     $ 52,700      
Gain on change of control of interests         $ 10,200  
Spread over LIBOR   3.625%        
Mortgage loan, maturity date         Feb. 01, 2023  
Mortgage loan carrying amount   $ 72,500        
Portside Apartment Holdings, L.L.C. [Member]            
Real Estate Properties [Line Items]            
Purchase price of property       $ 39,600    
Portside Apartment Developers, L.L.C. [Member]            
Real Estate Properties [Line Items]            
Percentage of interest in venture       38.25%    
Number of units | item       175    
Purchase price of property       $ 39,600    
Loans assumed       $ 42,500    
Gain on change of control of interests         $ 5,200  
Spread over LIBOR 3.44%          
Mortgage loan carrying amount $ 59,000