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Basis of Presentation and Summary of Significant Accounting Policies - Business Combinations (Details) - Venture Homes $ in Millions | Jul. 13, 2018 USD ($) home lot Community | Dec. 31, 2018 USD ($)
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Business Acquisition [Line Items] |  |
Purchase price, net of cash acquired | $ 61.3 |
Purchase price paid, net cash acquired |  | $ 57.3
Remaining payments due |  | $ 4.0
Number of active communities | Community | 27 |
Number of homes in backlog | home | 48 |
Number of model homes in backlog | home | 6 |
Inventory acquired | $ 56.0 |
Intangible Assets, Net (Including Goodwill) | 10.6 |
Other assets acquired | 0.7 |
Accounts payable | 5.5 |
Other liabilities assumed | $ 0.2 |
Minimum |  |
Business Acquisition [Line Items] |  |
Number of lots acquired | lot | 1,100 |

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