Long-Term Water Assets - Intangible Water Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Costs	$ 36,800	$ 36,800
Accumulated Depreciation	(11,645)	(10,964)
Net cost of purchased water contracts	25,155	25,836
Total tangible water assets	31,302	28,319
Net investment in water assets	56,457	54,155
Contract-based intangible assets | Dudley-Ridge water rights
Finite-Lived Intangible Assets [Line Items]
Costs	11,581	11,581
Accumulated Depreciation	(4,584)	(4,342)
Contract-based intangible assets | Nickel water rights
Finite-Lived Intangible Assets [Line Items]
Costs	18,740	18,740
Accumulated Depreciation	(4,283)	(3,962)
Contract-based intangible assets | Tulare Lake Basin water rights
Finite-Lived Intangible Assets [Line Items]
Costs	6,479	6,479
Accumulated Depreciation	$ (2,778)	$ (2,660)