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Sale of Property (Details) - USD ($)
3 Months Ended
Jan. 30, 2018
Mar. 31, 2018
Mar. 31, 2017
Jan. 31, 2018
Sale of Properties        
Total sales price, net of closing costs   $ 8,958,000    
Mortgage loan paid off   $ 9,099,000    
Property located in Fort Bend, Texas        
Sale of Properties        
Ownership percentage       85.00%
Property located in Fort Bend, Texas | Consolidated JV | Disposal Group, Disposed of by Sale, Not Discontinued Operations        
Sale of Properties        
Mortgage balance paid off $ 4,410,000      
Ownership percentage 85.00%      
Rental revenue percentage from property   0.30% 1.10%  
Gain on Sales of Real Estate, Net   $ 2,408,000    
Property located in Fort Bend, Texas | Consolidated JV | Non-Controlling Interests in Consolidated Joint Ventures | Disposal Group, Disposed of by Sale, Not Discontinued Operations        
Sale of Properties        
Non-controlling interest's share of the gain   $ 776,000    
Sale of Property | Property located in Fort Bend, Texas | Consolidated JV | Disposal Group, Disposed of by Sale, Not Discontinued Operations        
Sale of Properties        
Sales Price $ 8,958,000