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Basis of Presentation (Narrative) (Details) $ / shares in Units, shares in Thousands, $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 14, 2018 USD ($) | Jan. 01, 2018 USD ($) | Aug. 04, 2017 USD ($) $ / shares shares | Sep. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) segment | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Oct. 31, 2017 USD ($) | Nov. 30, 2016
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Number of operating segments | segment |  |  |  |  | 5 |  |  |  |
Business combination net of acquired cash |  |  |  |  | $ 28,036 | $ 77,457 |  |  |
Forfeited deposits |  |  |  | $ 500 | 900 |  |  |  |
Other income, land sales to third parties |  |  |  | 800 | 7,700 |  |  |  |
Cost of land dispositions |  |  |  | 600 | 7,800 |  |  |  |
Deferred revenue, related to unsatisfied performance obligations |  |  |  | 100 | 1,800 |  |  |  |
Deferred costs, related to unsatisfied performance obligations |  |  |  | 100 | 1,700 |  |  |  |
Reclassification of costs from inventory to property and equipment |  | $ 2,300 |  |  |  |  |  |  |
Decrease retained earnings |  | $ 600 |  |  |  |  |  |  |
Earnest money deposits |  |  |  | $ 18,988 | $ 18,988 |  | $ 14,077 |  |
UCP, Inc [Member] |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Conversion of stock, ratio |  |  | 0.2309% |  |  |  |  |  |
Business combination net of acquired cash |  |  | $ 100,150 |  |  |  |  |  |
Purchase price |  |  | 209,036 |  |  |  |  |  |
Business combination, purchase price |  |  | $ 107,737 |  |  |  |  |  |
Sundquist Homes [Member] |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  | $ 50,203 |
Wade Jurney Homes [Member] |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Purchase price | $ 73,125 |  |  |  |  |  |  |  |
Ownership interest | 50.00% |  |  |  |  |  |  |  | 50.00%
Business combination, purchase price | $ 37,500 |  |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Estimated life of the community based |  |  |  |  | 2 years |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Estimated life of the community based |  |  |  |  | 3 years |  |  |  |
Common Class A [Member] | UCP, Inc [Member] |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Conversion of stock, cash | $ / shares |  |  | $ 5.32 |  |  |  |  |  |
Century Common Stock [Member] | UCP, Inc [Member] |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Shares issued in connection to merger | shares |  |  | 4,176 |  |  |  |  |  |

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