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Business Acquisition - Bonterra (Details) - Bonterra Builders, LLC
$ in Millions
Jul. 01, 2015
USD ($)
property
Jun. 30, 2016
USD ($)
Business Acquisitions    
Acquisition price $ 99.8  
Estimate of total payment for the earn-out 6.0  
Consideration held as security $ 0.8  
Number of primary residential lots | property 1,700  
Earn-out    
Business Acquisitions    
Earn-out liability incurred $ 6.0  
Cumulative payments made on contingent consideration liability   $ 3.3