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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 22, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Income Tax Examination [Line Items]            
Effective tax rate   26.60%   26.60%   35.00%
Blended state and federal statutary rate       24.90%    
Increased (decreased) in effective tax rate   1.20%   2.60%    
Percentage of benefit to effective tax rate related to federal energy credits       1.70%    
Percentage of benefit for excess tax benefits for stock-based compensation       1.70%    
Increased (decreased) rate related to measurement period adjustments under SAB 118       (1.30%)    
Income tax provision   $ 500   $ 1,200    
Increased to effective tax rate       1.70%    
Income tax expense   $ 5,810 $ 5,686 $ 22,207 $ 17,216  
Scenario, Plan [Member]            
Income Tax Examination [Line Items]            
Effective tax rate       21.00%    
Interest Expense [Member]            
Income Tax Examination [Line Items]            
Percentage of limitation of tax deduction 30.00%          
Net Operating Loss [Member]            
Income Tax Examination [Line Items]            
Percentage of limitation of tax deduction 80.00%          
Wade Jurney Homes [Member]            
Income Tax Examination [Line Items]            
Increased (decreased) in effective tax rate       2.10%