Estimated Development Liability (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($) home	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) home	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Estimated Development Liability
Cash expenditures for obligations related to prior sales	$ 100	$ 200	$ 400	$ 300
Estimated development liability	$ 31,700		$ 31,700		$ 32,102
Minimum
Estimated Development Liability
Number of estimated homes the estimated liability covers (homesites) | home	8,000		8,000