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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% |  |

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