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Basis of Presentation Details (Details) - USD ($)
$ in Thousands
3 Months Ended
Oct. 05, 2017
Dec. 31, 2017
Dec. 31, 2018
Oct. 01, 2018
Sep. 30, 2018
Entity Information [Line Items]          
Real estate     $ 693,200   $ 498,000
Deferred Revenue     10,900   11,600
Contract with Customer, Liability     10,000 $ 6,400 $ 0
Majority Shareholder [Member] | D.R. Horton, Inc. [Member]          
Entity Information [Line Items]          
Sale of Stock, Percentage of Ownership after Transaction 75.00%        
Accounting Standards Update 2016-18 [Member]          
Entity Information [Line Items]          
Increase (Decrease) in Restricted Cash   $ (39,700)      
Real estate     8,900    
Deferred Revenue     (1,100)    
Contract with Customer, Liability     10,000    
Pro Forma [Member] | Accounting Standards Update 2016-18 [Member]          
Entity Information [Line Items]          
Real estate     684,300    
Deferred Revenue     12,000    
Contract with Customer, Liability     $ 0