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Business Acquisition - Bonterra (Details)
$ in Millions
9 Months Ended 15 Months Ended
Jul. 01, 2015
USD ($)
property
Sep. 30, 2016
USD ($)
Sep. 30, 2016
USD ($)
Bonterra Builders, LLC      
Business Acquisitions      
Acquisition price $ 99.8    
Contingent consideration payments   $ 0.4  
Consideration held as security $ 0.8    
Number of primary residential lots | property 1,700    
Bonterra Builders, LLC | Target threshold      
Business Acquisitions      
Liabilities incurred $ 6.0    
Earn-out      
Business Acquisitions      
Contingent consideration payments   $ 4.3  
Earn-out | Bonterra Builders, LLC      
Business Acquisitions      
Liabilities incurred $ 6.0    
Contingent consideration payments     $ 3.3