TANGIBLE WATER ASSETS AND REAL ESTATE, NET - Components of Tangible Water and Real Estate Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Real Estate [Abstract]
Tangible water assets	$ 26,570	$ 29,622
Real estate and improvements held and used, net of accumulated amortization of $12,003 at December 31, 2019 and December 31, 2018	9,469	9,469
Other real estate inventories	3,359	5,207
Total tangible water and real estate assets, net	39,398	44,298
Accumulated amortization of real estate improvements held and used	$ 12,003	$ 12,003