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Long-Term Water Assets - Intangible Water Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Costs | $ 36,800 | $ 36,800
Accumulated Depreciation | (9,942) | (9,601)
Net cost of purchased water contracts | 26,858 | 27,199
Total tangible water assets | 28,135 | 24,633
Net investment in water assets | 54,993 | 51,832
Contract-based intangible assets | Dudley-Ridge water rights |  |
Finite-Lived Intangible Assets [Line Items] |  |
Costs | 12,203 | 12,203
Accumulated Depreciation | (3,980) | (3,860)
Contract-based intangible assets | Nickel water rights |  |
Finite-Lived Intangible Assets [Line Items] |  |
Costs | 18,740 | 18,740
Accumulated Depreciation | (3,480) | (3,320)
Contract-based intangible assets | Tulare Lake Basin water rights |  |
Finite-Lived Intangible Assets [Line Items] |  |
Costs | 5,857 | 5,857
Accumulated Depreciation | $ (2,482) | $ (2,421)

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