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Inventory - Narrative (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
May 03, 2017 community lot | Jun. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Inventory Disclosure [Abstract] |  |  |  |
Number of communities tested for impairment | community | 17 |  |  |
Number of units in real estate property | lot | 4,600 |  |  |
Net realizable value adjustments (NRV) - land held for sale |  | $ 81,006 |  |
Carrying amount impaired land - prior impairment |  |  |  | $ 151,000
Number of communities | community | 2 |  |  |
Land inventory impairments |  | $ 31,487 | $ 13,973 | $ 131,254

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