Long-Term Water Assets - Intangible Water Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Costs	$ 36,800	$ 36,800
Accumulated Depreciation	(10,964)	(9,601)
Net cost of purchased water contracts	25,836	27,199
Total cost water held for future use	28,319	24,633
Net investment in water assets	54,155	51,832
Contract-based intangible assets | Dudley-Ridge water rights
Finite-Lived Intangible Assets [Line Items]
Costs	11,581	11,581
Accumulated Depreciation	(4,342)	(3,860)
Contract-based intangible assets | Nickel water rights
Finite-Lived Intangible Assets [Line Items]
Costs	18,740	18,740
Accumulated Depreciation	(3,962)	(3,320)
Contract-based intangible assets | Tulare Lake Basin water rights
Finite-Lived Intangible Assets [Line Items]
Costs	6,479	6,479
Accumulated Depreciation	$ (2,660)	$ (2,421)