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Revenues (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Oct. 01, 2018
Sep. 30, 2018
Revenue from External Customer [Line Items]        
Contract with Customer, Liability $ 10,000   $ 6,400 $ 0
Land and lot banking 2,200 $ 0    
Other 300 300    
Revenue, Net 38,500 30,900    
Retail Land Sales, Improvement Revenue, Prior Sales 900      
Residential Real Estate [Member]        
Revenue from External Customer [Line Items]        
Real Estate Revenue, Net 32,500 23,400    
Commercial Real Estate [Member]        
Revenue from External Customer [Line Items]        
Real Estate Revenue, Net $ 3,500 $ 7,200