Real Estate Inventories - Summary of Real Estate Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Real estate inventories:
Land deposits	$ 57,775	$ 51,833
Land and land under development	992,290	904,410
Homes completed and under construction	905,752	646,198
Model homes	96,000	97,409
Total	2,051,817	1,699,850
Not owned	$ 282,169	$ 0