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COMMITMENTS AND CONTINGENCIES - Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 USD ($) acrefoot entity $ / acrefoot | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Long-term purchase commitments - other disclosures |  |  |
Purchased water | $ 223,833 | $ 224,529 | $ 225,020
Operating lease renewal term | 25 years |  |
Finance lease renewal term | 25 years |  |
Contingency loss recognized liability | $ 6,000 |  |
Supply Commitment | Camino Real |  |  |
Long-term purchase commitments - other disclosures |  |  |
Payments for other commitments | 43,800 | 21,500 |
Additional payments for other commitments | $ 22,300 |  |
Minimum |  |  |
Long-term purchase commitments - other disclosures |  |  |
Operating lease term | 1 year |  |
Finance lease term | 1 year |  |
Maximum |  |  |
Long-term purchase commitments - other disclosures |  |  |
Operating lease term | 50 years |  |
Finance lease term | 50 years |  |
Kern County Water Agency (Agency) |  |  |
Long-term purchase commitments - other disclosures |  |  |
Total capital facilities charge and treated water charge obligation per acre foot | $ / acrefoot | 560.22 |  |
Portion of estimated operating cost per acre foot for treated water delivered | $ / acrefoot | 51.69 |  |
Santa Clara Valley Water District |  |  |
Long-term purchase commitments - other disclosures |  |  |
Payments to suppliers | $ 12,600 | 11,300 | 11,900
Stockton East Water District (SEWD) |  |  |
Long-term purchase commitments - other disclosures |  |  |
Payments to suppliers | $ 11,500 | $ 15,300 | $ 12,900
Kern County Water Agency (Agency) |  |  |
Long-term purchase commitments - other disclosures |  |  |
Minimum acre feet of treated water to be purchased per year over life of contract | acrefoot | 20,500 |  |
Minimum acre feet of treated water to be purchased under prior agreement | acrefoot | 11,500 |  |
Number of other parties obligated to purchase treated water | entity | 3 |  |
Minimum acre feet of treated water to be purchased per year by other parties | acrefoot | 32,500 |  |
Recorded unconditional purchase obligation | $ 82,400 |  |
Purchased water | 11,500 |  |
Water production costs | $ 4,700 |  |
Kern County Water Agency (Agency) | Guarantee Type, Other |  |  |
Long-term purchase commitments - other disclosures |  |  |
Unrecorded unconditional purchase obligation, minimum quantity required | acrefoot | 20,500 |  |

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