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Regulatory Assets and Liabilities - Schedule of Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
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Regulatory Assets and Liabilities |  |
Total Regulatory Assets | $ 276,592 | $ 283,620
Total Regulatory Liabilities | 206,971 | 213,679
Future tax benefits due to customers |  |
Regulatory Assets and Liabilities |  |
Total Regulatory Liabilities | 131,218 | 131,155
Pension and retiree group health |  |
Regulatory Assets and Liabilities |  |
Total Regulatory Liabilities | 58,678 | 58,678
HCBA |  |
Regulatory Assets and Liabilities |  |
Total Regulatory Liabilities | 3,041 | 14,318
PCBA |  |
Regulatory Assets and Liabilities |  |
Total Regulatory Liabilities | 3,862 | 0
CEBA |  |
Regulatory Assets and Liabilities |  |
Total Regulatory Liabilities | 912 | 6,036
Net WRAM and MCBA long-term payable |  |
Regulatory Assets and Liabilities |  |
Total Regulatory Liabilities | 1,826 | 172
Other components of net periodic benefit cost |  |
Regulatory Assets and Liabilities |  |
Total Regulatory Liabilities | 6,040 | 2,475
Other regulatory liabilities |  |
Regulatory Assets and Liabilities |  |
Total Regulatory Liabilities | 1,394 | 845
Retiree group health |  |
Regulatory Assets and Liabilities |  |
Total Regulatory Assets | 0 | 171
Future tax benefits due to customers |  |
Regulatory Assets and Liabilities |  |
Total Regulatory Assets | 143,546 | 143,546
Other accrued benefits |  |
Regulatory Assets and Liabilities |  |
Total Regulatory Assets | 26,085 | 24,946
Net WRAM and MCBA long-term accounts receivable |  |
Regulatory Assets and Liabilities |  |
Total Regulatory Assets | 45,034 | 41,558
Asset retirement obligations, net |  |
Regulatory Assets and Liabilities |  |
Total Regulatory Assets | 26,129 | 24,548
Interim rates memorandum account (IRMA) long-term accounts receivable |  |
Regulatory Assets and Liabilities |  |
Total Regulatory Assets | 3,416 | 3,682
Tank coating |  |
Regulatory Assets and Liabilities |  |
Total Regulatory Assets | 18,920 | 16,395
Recoverable property losses |  |
Regulatory Assets and Liabilities |  |
Total Regulatory Assets | 2,890 | 3,144
PCBA |  |
Regulatory Assets and Liabilities |  |
Total Regulatory Assets | $ 3,933 | 19,091
General district balancing account receivable |  |
Regulatory Assets and Liabilities |  |
Recovery Period | 1 year |
Total Regulatory Assets | $ 387 | 377
Customer assistance program (CAP) and Rate support fund (RSF) accounts receivable |  |
Regulatory Assets and Liabilities |  |
Recovery Period | 1 year |
Total Regulatory Assets | $ 3,281 | 2,965
Other regulatory assets |  |
Regulatory Assets and Liabilities |  |
Total Regulatory Assets | $ 2,971 | $ 3,197
Minimum | Interim rates memorandum account (IRMA) long-term accounts receivable |  |
Regulatory Assets and Liabilities |  |
Recovery Period | 1 year |
Maximum | Interim rates memorandum account (IRMA) long-term accounts receivable |  |
Regulatory Assets and Liabilities |  |
Recovery Period | 2 years |

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