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v3.19.1

Long-Term Water Assets - Additional Information (Details) | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2019 $ / acre ft acre ft | Dec. 31, 2018 acre ft | Dec. 31, 2013 acre ft | Dec. 31, 2009 acre ft | Dec. 31, 2008 acre ft
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
Contract renewal optional term | 35 years |  |  |  |
AVEK water bank |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
AVEK water bank (in acre-feet) | 13,033,000 | 13,033,000 |  | 6,393 | 8,393
SWP water contracts |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
AVEK water for future delivery (in acre-feet) |  |  |  | 3,444 |
DMB |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
Contract renewal optional term | 35 years |  |  |  |
Consumer price per acre-foot | $ / acre ft | 769 |  |  |  |
DMB | Maximum |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
Annual fee increase, percent | 3.00% |  |  |  |
DMB | Transferable water |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
Long-term water assets (in acre-feet) | 6,693 |  | 6,693 |  |
PEF | Transferable water | Ranchcorp |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
Consumer price per acre-foot | $ / acre ft | 1,120 |  |  |  |
Annual fee increase, percent | 3.00% |  |  |  |
Water assets, volume available for purchase from 2017-2030 (up to) (in acre-feet) | 3,500 |  |  |  |
Annual option payment, percent | 30.00% |  |  |  |

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