Significant Accounting Policies - Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Real Estate
Disaggregation of revenue
Revenue	$ 158,629	$ 87,627	$ 61,488
Homebuilder Homesite Sales, Lot Residuals
Disaggregation of revenue
Revenue	4,800	1,900	2,500
Homebuilder homesite sales, Certain products and services
Disaggregation of revenue
Revenue	$ 2,400	$ 1,900	$ 2,300