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Business Combinations (Narrative) (Details) $ / shares in Units, shares in Thousands, $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended |  |
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Jun. 14, 2018 USD ($) | Aug. 17, 2017 USD ($) | Aug. 04, 2017 USD ($) item $ / shares shares | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Oct. 31, 2017 USD ($) | Nov. 30, 2016
Business Combinations [Line Items] |  |  |  |  |  |  |  |  |
Total cash consideration |  |  |  |  |  | $ 28,036 | $ 77,457 |  |
Acquisition expense |  |  |  | $ 58 | $ 7,205 | 395 | 8,645 |  |
Proceeds from sale of BMCH South Carolina, LLC operations |  |  |  |  |  |  | 17,074 |  |
Equity in income of unconsolidated subsidiaries |  |  |  |  | 3,716 | 14,849 | 7,648 |  |
Revenues |  |  |  | 561,729 | 379,716 | 1,495,467 | 899,855 |  |
Income before income tax expense |  |  |  | 22,858 | $ 15,156 | 92,468 | $ 50,316 |  |
UCP, Inc [Member] |  |  |  |  |  |  |  |  |
Business Combinations [Line Items] |  |  |  |  |  |  |  |  |
Cash paid per share | $ / shares |  |  | $ 5.32 |  |  |  |  |  |
Conversion of stock, ratio |  |  | 0.2309% |  |  |  |  |  |
Total cash consideration |  |  | $ 100,150 |  |  |  |  |  |
Cash acquired from business acquisition |  |  | $ 20,264 |  |  |  |  |  |
Fractional shares | shares |  |  | 0 |  |  |  |  |  |
Total fair value of awards |  |  | $ 6,200 |  |  |  |  |  |
Total fair value of award attribute to services performed by UCP |  |  | 1,149 |  |  |  |  |  |
Expense related to refinements of estimated fair value of inventories |  |  |  |  |  | 1,500 |  |  |
Acquisition expense |  |  | 9,600 |  |  |  |  |  |
Total consideration in cash and equity |  |  | $ 209,036 |  |  |  |  |  |
Number of lots | item |  |  | 4,199 |  |  |  |  |  |
Number of communities | item |  |  | 43 |  |  |  |  |  |
Number of homes in backlog | item |  |  | 346 |  |  |  |  |  |
Number of model homes | item |  |  | 59 |  |  |  |  |  |
Proceeds from sale of BMCH South Carolina, LLC operations |  | $ 17,100 |  |  |  |  |  |  |
Goodwill amount expected to be tax deductible |  |  |  | $ 5,400 |  | $ 5,400 |  |  |
Business combination, purchase price |  |  | $ 107,737 |  |  |  |  |  |
UCP, Inc [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Business Combinations [Line Items] |  |  |  |  |  |  |  |  |
Market gross margin |  |  |  | 6.00% |  | 6.00% |  |  |
UCP, Inc [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Business Combinations [Line Items] |  |  |  |  |  |  |  |  |
Market gross margin |  |  |  | 20.00% |  | 20.00% |  |  |
UCP, Inc [Member] | Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |
Business Combinations [Line Items] |  |  |  |  |  |  |  |  |
Conversion of stock, shares | shares |  |  | 200 |  |  |  |  |  |
Sundquist Homes [Member] |  |  |  |  |  |  |  |  |
Business Combinations [Line Items] |  |  |  |  |  |  |  |  |
Total consideration in cash and equity |  |  |  |  |  |  |  | $ 50,203 |
Goodwill amount expected to be tax deductible |  |  |  | $ 4,800 |  | $ 4,800 |  |  |
Sundquist Homes [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Business Combinations [Line Items] |  |  |  |  |  |  |  |  |
Market gross margin |  |  |  | 6.00% |  | 6.00% |  |  |
Sundquist Homes [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Business Combinations [Line Items] |  |  |  |  |  |  |  |  |
Market gross margin |  |  |  | 20.00% |  | 20.00% |  |  |
Wade Jurney Homes [Member] |  |  |  |  |  |  |  |  |
Business Combinations [Line Items] |  |  |  |  |  |  |  |  |
Cash acquired from business acquisition | $ 9,464 |  |  |  |  |  |  |  |
Total consideration in cash and equity | $ 73,125 |  |  |  |  |  |  |  |
Ownership interest | 50.00% |  |  |  |  |  |  |  | 50.00%
Business combination, purchase price | $ 37,500 |  |  |  |  |  |  |  |
Previously held equity interest | 35,625 |  |  |  |  |  |  |  |
Estimated discount for lack of control |  |  |  |  |  | $ 1,900 |  |  |
Equity in income of unconsolidated subsidiaries |  |  |  |  |  | 7,200 |  |  |
Income before income tax expense |  |  |  | $ 500 |  | 300 |  |  |
Wade Jurney Homes [Member] | Home Building [Member] |  |  |  |  |  |  |  |  |
Business Combinations [Line Items] |  |  |  |  |  |  |  |  |
Revenues |  |  |  | $ 87,500 |  | $ 112,700 |  |  |
Wade Jurney Homes [Member] |  |  |  |  |  |  |  |  |
Business Combinations [Line Items] |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  | 100.00% |  | 100.00% |  |  |
Trade Names [Member] | Wade Jurney Homes [Member] |  |  |  |  |  |  |  |  |
Business Combinations [Line Items] |  |  |  |  |  |  |  |  |
Estimated fair value | $ 3,000 |  |  |  |  |  |  |  |
Amortization period | 10 years |  |  |  |  |  |  |  |
Non-Compete Agreements [Member] | Wade Jurney Homes [Member] |  |  |  |  |  |  |  |  |
Business Combinations [Line Items] |  |  |  |  |  |  |  |  |
Estimated fair value | $ 400 |  |  |  |  |  |  |  |
Amortization period | 2 years |  |  |  |  |  |  |  |
Century Common Stock [Member] | UCP, Inc [Member] |  |  |  |  |  |  |  |  |
Business Combinations [Line Items] |  |  |  |  |  |  |  |  |
Shares issued in connection to merger | shares |  |  | 4,176 |  |  |  |  |  |

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