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COMMITMENTS AND CONTINGENCIES - Narrative (Details) |  | 12 Months Ended
--- | --- | ---
Dec. 20, 2017 USD ($) well | Dec. 31, 2020 USD ($) acrefoot entity | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Long-term purchase commitments - other disclosures |  |  |  |
Operating lease renewal term |  | 25 years |  |
Finance lease renewal term |  | 25 years |  |
Rent expense |  |  |  | $ 2,000,000.0
Contingency loss recognized liability |  | $ 2,600,000 |  |
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 |  |
Santa Clara Valley Water District |  |  |  |
Long-term purchase commitments - other disclosures |  |  |  |
Annual cost |  | $ 15,200,000 | $ 13,600,000 | 9,700,000
Stockton East Water District (SEWD) |  |  |  |
Long-term purchase commitments - other disclosures |  |  |  |
Annual cost |  | $ 14,300,000 | $ 13,300,000 | $ 13,700,000
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 |  |
Total obligation of all parties, excluding the Company |  | $ 82,400,000 |  |
Total capital facilities charge and treated water charge obligation |  | 9,800,000 |  |
Total capital facilities charge and treated water charge obligation per acre foot |  | 476.83 |  |
Total treated water charge |  | 3,700,000 |  |
Portion of estimated operating cost per acre foot for treated water delivered |  | 55.8 |  |
California Water Service Company and City of Bakersfield v. The Dow Chemical Company, et al., Civil Case No. CIV-470999 (TCP Action) |  |  |  |
Long-term purchase commitments - other disclosures |  |  |  |
Amount awarded | $ 85,000,000.0 |  |  |
Proceeds from legal settlements | $ 56,000,000.0 | $ 46,700,000 |  |
Claims settled | well | 47 |  |  |
Total claims | well | 57 |  |  |
Release from future claims | well | 36 |  |  |

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