Real Estate Inventories and Capitalized Interest - Interest Incurred, Capitalized, and Expensed (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Real Estate [Abstract]
Interest incurred	$ 6,780	$ 2,273	$ 15,217	$ 5,243
Interest capitalized to inventory	(6,232)	(2,273)	(13,982)	(5,243)
Interest Capitalized to Investments in Unconsolidated Joint Ventures	(548)	0	(1,235)	0
Interest expense	0	0	0	0
Capitalized Interest [Roll Forward]
Capitalized interest in beginning inventory	10,821	5,449	6,342	4,190
Interest capitalized as a cost of inventory	6,232	2,273	13,982	5,243
Capitalized interest acquired from unconsolidated joint venture at consolidation	76	0	76	0
Previously capitalized interest included in cost of sales	(2,448)	(1,306)	(5,719)	(3,017)
Capitalized interest in ending inventory	14,681	6,416	14,681	6,416
Capitalized Interest in Beginning Investments in Unconsolidated Joint Ventures	687	0	0	0
Interest Capitalized to Investments in Unconsolidated Joint Ventures	548	0	1,235	0
Capitalized Interest Transferred from Investment in Unconsolidated Joint Venture to Inventory Upon Consolidation	(76)	0	(76)	0
Previously Capitalized Interest Included in Equity in Net Income of Unconsolidated Joint Ventures	(5)	0	(5)	0
Capitalized Interest in Ending Investments in Unconsolidated Joint Ventures	1,154	0	1,154	0
Capitalized Interest in Ending Inventory and Investments in Unconsolidated Joint Ventures	$ 15,835	$ 6,416	$ 15,835	$ 6,416
Capitalized Interest as a Percentage of Inventory	3.00%	2.00%	3.00%	2.00%
Interest included in cost of sales as a percentage of home sales revenue	2.00%	1.00%	2.00%	1.00%
Capitalized Interest As A Percentage Of Investments In And Advances to Unconsolidated Joint Ventures	2.00%	0.00%	2.00%	0.00%