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Inventory - Recoverability Schedule of Inventory assets Held for Development, by Reportable Segment (Details) (Details) $ in Thousands | Dec. 31, 2018 USD ($) Community | Dec. 31, 2017 Community
--- | --- | ---
Real Estate Properties [Line Items] |  |
Number of Communities on Watch List | 4 | 2
Number of Communities | 1 | 0
Pre-analysis Book Value | $ | $ 2,612 |
West Segment |  |
Real Estate Properties [Line Items] |  |
Number of Communities on Watch List | 3 |
Number of Communities | 0 |
Pre-analysis Book Value | $ | $ 0 |
Aggregate Undiscounted Cash Flow as a % of BV | 0.00% |
Southeast Segment |  |
Real Estate Properties [Line Items] |  |
Number of Communities on Watch List | 1 |
Number of Communities | 1 |
Pre-analysis Book Value | $ | $ 2,225 |
Aggregate Undiscounted Cash Flow as a % of BV | 71.30% |
Corporate and unallocated |  |
Real Estate Properties [Line Items] |  |
Number of Communities on Watch List | 0 |
Number of Communities | 0 |
Pre-analysis Book Value | $ | $ 387 |

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