Annual report pursuant to Section 13 and 15(d)

Recent Transactions (Consolidations) (Narrative) (Details)

v3.6.0.2
Recent Transactions (Consolidations) (Narrative) (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Jul. 08, 2016
USD ($)
Jan. 19, 2016
USD ($)
Jan. 05, 2016
USD ($)
item
Jun. 30, 2016
USD ($)
item
Mar. 31, 2016
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Real Estate Properties [Line Items]                  
Purchase price of property             $ 121,582 $ 94,073 $ 91,813
Gain on change of control of interests       $ 5,191 $ 10,156   15,347    
Mortgage loan carrying amount               59,700  
Gain on sale of investment in unconsolidated joint venture       $ 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            
Spread over LIBOR   3.625%              
Mortgage loan, maturity date             Feb. 01, 2023    
Gain on sale of investment in unconsolidated joint venture             $ 10,200    
Portside Apartment Holdings, 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          
Gain on change of control of interests             $ 5,200    
Spread over LIBOR 3.44%                
Mortgage loan, maturity date             Aug. 01, 2023    
Mortgage loan carrying amount $ 59,000     $ 42,500