Inventory Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	May 03, 2017 community lot
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Number of units in real estate property | lot					4,600
Number of communities | community					2
Number of lots, monetize | lot					400
Land-related Charges - NRV Impairments Re acquisition writeoffs			$ 120,000
Carrying amount impaired land-prior impairment	$ 161,900		161,900
Write-offs of deposits and pre-acquisition costs			5,100
Write-offs of deposits and pre-acquisition costs	$ 2,680	$ 2,541	$ 9,397	$ 12,996
Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate			18.00%
Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate			25.00%