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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Lessor, Lease, Description [Line Items] |  |  |
Maximum collection period in which deferred net WRAM and MCBA revenues and associated costs will be recognized | 24 months |  |
Revenue from contracts with customers | $ 772,616 | $ 765,704 | $ 697,577
Optional lease renewal term | 15 years |  |
Provision for depreciation expressed as a percentage of the aggregate depreciable asset balances | 2.90% | 2.96% | 2.94%
Proceeds collected through a surcharge on certain customers' bills | $ 400 | $ 400 |
Goodwill impairment | 0 | 0 | $ 0
Amortization of debt premium and expenses | 369 | 366 | $ 412
Total refunds | $ 199,832 | $ 198,086 |
Refund period | 40 years |  |
Insurance Programs |  |  |
Lessor, Lease, Description [Line Items] |  |  |
Revenue from contracts with customers | $ 2,700 |  |
Minimum |  |  |
Lessor, Lease, Description [Line Items] |  |  |
Term of contract | 5 years |  |
Maximum |  |  |
Lessor, Lease, Description [Line Items] |  |  |
Term of contract | 10 years |  |

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