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Regulatory Assets and Liabilities - Schedule of Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
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Regulatory Assets and Liabilities [Line Items] |  |
Recovery Period | 1 year |
Total Regulatory Assets | $ 367,231 | $ 357,406
Total Regulatory Liabilities | 826,595 | 814,551
Cost of removal |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Liabilities | 493,688 | 483,108
Pension and retiree group health |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Liabilities | 174,341 | 174,708
Future tax benefits due to customers |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Liabilities | 105,402 | 106,184
Other components of net periodic benefit cost |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Liabilities | 19,645 | 18,287
Pension Cost Balancing Account |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Liabilities | 15,091 | 14,143
Incremental Cost Balancing Accounts (ICBA) |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Liabilities | 5,700 | 6,003
Health Cost Balancing Account |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Liabilities | 4,458 | 3,630
Conservation Expense Balancing Account |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Liabilities | 3,199 | 3,294
Net WRAM and MCBA long-term payable |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Liabilities | 3,075 | 3,064
Other regulatory liabilities |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Liabilities | 1,996 | 2,130
Property-related temporary differences (tax benefits flowed through to customers) |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Assets | 178,279 | 178,279
IRMA long-term accounts receivable |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Assets | 41,690 | 46,278
Asset retirement obligations, net |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Assets | 29,599 | 28,883
MWRAM long-term regulatory asset |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Assets | $ 28,750 | 16,353
MWRAM long-term regulatory asset | Minimum |  |
Regulatory Assets and Liabilities [Line Items] |  |
Recovery Period | 1 year |
MWRAM long-term regulatory asset | Maximum |  |
Regulatory Assets and Liabilities [Line Items] |  |
Recovery Period | 2 years |
Other accrued benefits |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Assets | $ 26,671 | 25,439
Tank coating |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Assets | $ 20,822 | 21,477
Customer Assistance Program and Rate Support Fund accounts receivable |  |
Regulatory Assets and Liabilities [Line Items] |  |
Recovery Period | 1 year |
Total Regulatory Assets | $ 10,529 | 9,910
General District Balancing Account receivable |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Assets | 9,499 | 9,393
Incremental Cost Balancing Accounts (ICBA) |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Assets | 8,023 | 8,251
Net WRAM and Modified Cost Balancing Account (MCBA) long-term accounts receivable |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Assets | 3,460 | 3,633
Recoverable property losses |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Assets | 2,463 | 2,633
Other regulatory assets |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Assets | $ 7,446 | $ 6,877

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