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REGULATORY ASSETS AND LIABILITIES - Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Regulatory Assets and Liabilities |  |
Regulatory Assets | $ 257,621 | $ 283,620
Regulatory Liabilities | 683,717 | 627,740
Revision of Prior Period, Adjustment |  |
Regulatory Assets and Liabilities |  |
Regulatory Liabilities |  | 414,100
Cost of removal |  |
Regulatory Assets and Liabilities |  |
Regulatory Liabilities | 447,356 | 414,061
Future tax benefits due to customers |  |
Regulatory Assets and Liabilities |  |
Regulatory Liabilities | 118,051 | 131,155
Pension and retiree group health |  |
Regulatory Assets and Liabilities |  |
Regulatory Liabilities | 88,728 | 58,678
HCBA |  |
Regulatory Assets and Liabilities |  |
Regulatory Liabilities | 3,242 | 14,318
CEBA |  |
Regulatory Assets and Liabilities |  |
Regulatory Liabilities | 1,200 | 6,036
Net WRAM and MCBA long-term payable |  |
Regulatory Assets and Liabilities |  |
Regulatory Liabilities | 2,071 | 172
Other components of net periodic benefit cost |  |
Regulatory Assets and Liabilities |  |
Regulatory Liabilities | 10,348 | 2,475
RSF regulatory liability |  |
Regulatory Assets and Liabilities |  |
Regulatory Liabilities | 2,116 | 0
Other regulatory liabilities |  |
Regulatory Assets and Liabilities |  |
Regulatory Liabilities | 1,633 | 845
Property-related temporary differences (tax benefits flowed through to customers) |  |
Regulatory Assets and Liabilities |  |
Regulatory Assets | 158,486 | 143,546
Other accrued benefits |  |
Regulatory Assets and Liabilities |  |
Regulatory Assets | 25,363 | 24,946
Net WRAM and MCBA long-term accounts receivable |  |
Regulatory Assets and Liabilities |  |
Regulatory Assets | 10,738 | 41,558
Asset retirement obligations, net |  |
Regulatory Assets and Liabilities |  |
Regulatory Assets | 26,686 | 24,548
Tank coating |  |
Regulatory Assets and Liabilities |  |
Regulatory Assets | 19,602 | 16,395
IRMA long-term accounts receivable |  |
Regulatory Assets and Liabilities |  |
Regulatory Assets | 3,430 | 3,682
Recoverable property losses |  |
Regulatory Assets and Liabilities |  |
Regulatory Assets | 3,121 | 3,144
PCBA |  |
Regulatory Assets and Liabilities |  |
Regulatory Assets | 4,182 | 19,091
Regulatory Liabilities | 8,972 | 0
General district balancing account receivable |  |
Regulatory Assets and Liabilities |  |
Regulatory Assets | $ 390 | 377
Customer assistance program (CAP) and Rate support fund (RSF) accounts receivable |  |
Regulatory Assets and Liabilities |  |
Recovery Period | 1 year |
Regulatory Assets | $ 2,459 | 2,965
Other regulatory assets |  |
Regulatory Assets and Liabilities |  |
Regulatory Assets | $ 3,164 | $ 3,368
Minimum | IRMA long-term accounts receivable |  |
Regulatory Assets and Liabilities |  |
Recovery Period | 1 year |
Maximum | IRMA long-term accounts receivable |  |
Regulatory Assets and Liabilities |  |
Recovery Period | 2 years |

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