Inventory (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Properties for sale	$ 14,748	$ 12,649
Properties not available for sale	1,920	2,328
Properties under improvement	21,638	7,717
Inventory	38,306	22,694
Lower of cost or net realizable value write-downs	$ 100	$ 190