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