Capitalized Interest (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Capitalized Interest [Abstract]
Interest incurred	$ 28,377	$ 21,978	$ 7,484
Interest expensed	0	0	0
Interest capitalized to inventory	(27,393)	(20,394)	(7,484)
Interest Capitalized to Investments in Unconsolidated Joint Ventures	(984)	(1,584)	0
Real Estate Inventory, Capitalized Interest Costs [Roll Forward]
Capitalized interest in beginning inventory	16,453	6,342	4,190
Interest capitalized as a cost of inventory	27,393	20,394	7,484
Capitalized interest acquired from unconsolidated joint venture at consolidation	0	738	0
Capitalized interest transferred from investment in unconsolidated joint venture to inventory upon lot acquisition	513	0	0
Contribution to unconsolidated joint ventures	0	0	(1)
Previously capitalized interest included in cost of home sales	(18,678)	(11,021)	(5,331)
Capitalized interest in ending inventory	25,681	16,453	6,342
Real Estate Inventory, Capitalized Interest Costs in Unconsolidated Joint Venture [Roll Forward]
Capitalized interest in beginning investment in unconsolidated joint ventures	1,472	0	0
Interest capitalized to investment in unconsolidated joint ventures	984	1,584	0
Capitalized interest transferred from investment in unconsolidated joint venture to inventory upon consolidation	0	(76)	0
Capitalized interest transferred from investment in unconsolidated joint venture to inventory upon lot acquisition	(513)	0	0
Previously capitalized interest included in equity in net income (loss) of unconsolidated joint ventures	(1,230)	(36)	0
Capitalized interest in ending investment in unconsolidated joint ventures	713	1,472	0
Total capitalized interest in ending inventory and investments in unconsolidated joint ventures	$ 26,394	$ 17,925	$ 6,342
Capitalized interest as a percentage of inventory	4.50%	4.00%	2.20%
Interest included in cost of home sales as a percentage of home sales revenue	3.70%	2.00%	1.10%
Capitalized interest as a percentage of investment in and advances to unconsolidated joint ventures	2.10%	2.60%	0.00%
OTTI - Interest previously capitalized to investment in unconsolidated JV	$ 1,100	$ 0	$ 0