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Business Combination (Narrative) (Details) - USD ($)
$ in Thousands
2 Months Ended 3 Months Ended 6 Months Ended
Apr. 26, 2018
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Business Acquisition [Line Items]            
Homebuilding revenues     $ 143,878 $ 100,345 $ 264,244 $ 193,742
Income before tax     $ 24,230 $ 13,813 40,841 $ 25,928
GHO Homes            
Business Acquisition [Line Items]            
Homebuilding revenues   $ 10,900        
Income before tax   $ 900        
GHO Homes            
Business Acquisition [Line Items]            
Percent of equity interests acquired 80.00%          
Ownership percentage by noncontrolling owners 20.00%          
Consideration transferred $ 33,900          
Cash paid to previous owner of GHO Homes 33,200          
Contingent consideration $ 600          
Potential obligation to pay additional contingent consideration if certain annual performance targets are met, period following acquisition date 3 years          
Integration costs incurred         $ 200  
GHO Homes | Previous Owner of GHO Homes            
Business Acquisition [Line Items]            
Ownership percentage by noncontrolling owners 20.00%