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Investments in Unconsolidated Ventures (Details)
3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
property
Dec. 31, 2016
USD ($)
Sep. 30, 2017
USD ($)
property_unit
Schedule of Equity Method Investments [Line Items]      
Number of properties | property 34    
Carrying Value $ 0 $ 14,335,000  
Equity in loss of unconsolidated joint ventures $ 25,000 $ 0  
Joint venture, forty six percent ownership      
Schedule of Equity Method Investments [Line Items]      
Number of real estate properties, to be constructed | property_unit     339
Other investments      
Schedule of Equity Method Investments [Line Items]      
Carrying Value     $ 109,000
Unconsolidated joint ventures      
Schedule of Equity Method Investments [Line Items]      
Number of properties | property_unit     1,026,000
Carrying Value     $ 21,115,000
Mortgage Debt     $ 66,350,000
Columbia, SC | Joint venture, thirty two percent ownership      
Schedule of Equity Method Investments [Line Items]      
Number of properties | property_unit     374,000
Carrying Value     $ 4,901,000
Mortgage Debt     $ 41,000,000
Percent Ownership     32.00%
Columbia, SC (Location 2) | Joint venture, forty six percent ownership      
Schedule of Equity Method Investments [Line Items]      
Number of properties | property_unit     339,000
Carrying Value     $ 8,665,000
Mortgage Debt     $ 0
Percent Ownership     46.00%
Forney, TX | Joint venture, fifty percent ownership      
Schedule of Equity Method Investments [Line Items]      
Number of properties | property_unit     313,000
Carrying Value     $ 7,440,000
Mortgage Debt     $ 25,350,000
Percent Ownership     50.00%
Secured Debt | Joint venture, forty six percent ownership      
Schedule of Equity Method Investments [Line Items]      
Construction financing     $ 47,426,000
Interest rate     4.08%