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Long Term Water Assets Long Term Water Assets - Intangible Water Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Costs | $ 36,800 | $ 36,800
Accumulated Depreciation | (8,241) | (6,890)
Net cost of purchased water contracts | 28,559 | 29,910
Total cost water held for future use | 18,571 | 13,854
Net investment in water assets | 47,130 | 43,764
Contract-based intangible assets | Dudley Ridge water rights |  |
Finite-Lived Intangible Assets [Line Items] |  |
Costs | 12,203 | 12,203
Accumulated Depreciation | (3,377) | (2,895)
Contract-based intangible assets | Nickel water rights |  |
Finite-Lived Intangible Assets [Line Items] |  |
Costs | 18,740 | 18,740
Accumulated Depreciation | (2,678) | (2,218)
Contract-based intangible assets | Tulare Lake Basin water rights |  |
Finite-Lived Intangible Assets [Line Items] |  |
Costs | 5,857 | 5,857
Accumulated Depreciation | $ (2,186) | $ (1,777)

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