TANGIBLE WATER ASSETS AND REAL ESTATE, NET - Components of Tangible Water and Real Estate Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Real Estate [Abstract]
Tangible water assets	$ 26,546	$ 26,570
Real estate and improvements held and used, net of accumulated amortization of $12,003 at December 31, 2020 and December 31, 2019	9,469	9,469
Other real estate inventories	3,359	3,359
Total tangible water and real estate assets, net	39,374	39,398
Accumulated amortization of real estate improvements held and used	$ 12,003	$ 12,003