REAL ESTATE OPERATIONS - Real Estate Operations Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues
Revenue from contract with customer, including assessed tax	$ 544	$ 214	$ 631	$ 709
Subsurface Revenue	$ 544	196	621	637
Impact Fee and Mitigation Credit Sales
Revenues
Revenue from contract with customer, including assessed tax			4
Fill Dirt and Other Revenue
Revenues
Revenue from contract with customer, including assessed tax		$ 18	$ 6	$ 72