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Regulatory Assets and Liabilities - Schedule of Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Assets | $ 384,501 | $ 257,621
Total Regulatory Liabilities | 729,904 | 683,717
Cost of removal |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Liabilities | 456,471 | 447,356
Future tax benefits due to customers |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Liabilities | 118,051 | 118,051
Pension and retiree group health |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Liabilities | 102,255 | 88,728
Incremental cost balancing account (ICBA) |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Liabilities | 10,795 | 0
IRMA long-term regulatory liability |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Liabilities | 6,993 | 0
Health Cost Balancing Account (HCBA) |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Liabilities | 4,291 | 3,242
PCBA |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Liabilities | 11,220 | 8,972
Conservation Expense Balancing Account |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Liabilities | 1,324 | 1,200
Net WRAM and MCBA long-term payable |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Liabilities | 3,082 | 2,071
Other components of net periodic benefit cost |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Liabilities | 13,300 | 10,348
RSF regulatory liability |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Liabilities | 0 | 2,116
Other regulatory liabilities |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Liabilities | 2,122 | 1,633
Future tax benefits due to customers |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Assets | 158,486 | 158,486
Other accrued benefits |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Assets | 26,975 | 25,363
Net WRAM and Modified Cost Balancing Account (MCBA) long-term accounts receivable |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Assets | 10,490 | 10,738
Asset retirement obligations, net |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Assets | 27,495 | 26,686
IRMA long-term accounts receivable |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Assets | $ 84,593 | 3,430
MWRAM |  |
Regulatory Assets and Liabilities [Line Items] |  |
Recovery Period | 1 year |
Total Regulatory Assets | $ 31,066 | 0
Tank coating |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Assets | 20,112 | 19,602
Recoverable property losses |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Assets | 2,956 | 3,121
PCBA |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Assets | $ 4,314 | 4,182
Customer assistance program (CAP) and Rate support fund (RSF) accounts receivable |  |
Regulatory Assets and Liabilities [Line Items] |  |
Recovery Period | 1 year |
Total Regulatory Assets | $ 10,787 | 2,459
Other regulatory assets |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Assets | $ 7,227 | $ 3,554
Minimum | IRMA long-term accounts receivable |  |
Regulatory Assets and Liabilities [Line Items] |  |
Recovery Period | 1 year |
Maximum | IRMA long-term accounts receivable |  |
Regulatory Assets and Liabilities [Line Items] |  |
Recovery Period | 2 years |

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