Quarterly report pursuant to Section 13 or 15(d)

Recent Transactions (Consolidations) (Narrative) (Details)

v3.5.0.2
Recent Transactions (Consolidations) (Narrative) (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jan. 19, 2016
USD ($)
Jan. 05, 2016
USD ($)
item
Jun. 30, 2016
USD ($)
item
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
item
Jun. 30, 2015
USD ($)
Real Estate Properties [Line Items]            
Purchase price of property         $ 51,638 $ 42,881
Gain on change of control of interests     $ 5,191   15,347  
Mortgage loan carrying amount     1,694,252   1,694,252  
Gain on sale of investment in unconsolidated joint ventures     5,670 $ 6,448 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 $ 72,500 $ 52,700        
Gain on change of control of interests         $ 10,200  
Spread over LIBOR 3.625%          
Mortgage loan, maturity date         Feb. 01, 2023  
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%   38.25%  
Number of units | item     175   175  
Purchase price of property     $ 39,600      
Gain on change of control of interests     5,200   $ 5,200  
Mortgage loan carrying amount     $ 42,500   $ 42,500  
Portside Apartment Developers, L.L.C. [Member] | LIBOR [Member]            
Real Estate Properties [Line Items]            
Spread over LIBOR     2.15%      
Portside Apartment Developers, L.L.C. [Member] | Floor [Member]            
Real Estate Properties [Line Items]            
Spread over LIBOR     2.75%