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Regulatory Assets and Liabilities - Schedule of Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
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Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Assets | $ 397,498 | $ 257,621
Total Regulatory Liabilities | 742,842 | 683,717
Cost of removal |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Liabilities | 464,980 | 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 | 102,120 | 88,728
Other components of net periodic benefit cost |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Liabilities | 15,160 | 10,348
PCBA |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Liabilities | 12,642 | 8,972
Incremental cost balancing account (ICBA) |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Liabilities | 12,704 | 0
IRMA long-term regulatory liability |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Liabilities | 8,032 | 0
Health Cost Balancing Account (HCBA) |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Liabilities | 3,606 | 3,242
Net WRAM and MCBA long-term payable |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Liabilities | 2,860 | 2,071
Conservation Expense Balancing Account |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Liabilities | 1,058 | 1,200
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 | 1,629 | 1,633
Future tax benefits due to customers |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Assets | 158,486 | 158,486
IRMA long-term accounts receivable |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Assets | $ 92,065 | 3,430
MWRAM |  |
Regulatory Assets and Liabilities [Line Items] |  |
Recovery Period | 1 year |
Total Regulatory Assets | $ 38,566 | 0
Other accrued benefits |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Assets | 26,917 | 25,363
Asset retirement obligations, net |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Assets | 28,311 | 26,686
Tank coating |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Assets | $ 20,480 | 19,602
Customer assistance program (CAP) and Rate support fund (RSF) accounts receivable |  |
Regulatory Assets and Liabilities [Line Items] |  |
Recovery Period | 1 year |
Total Regulatory Assets | $ 10,015 | 2,459
Net WRAM and Modified Cost Balancing Account (MCBA) long-term accounts receivable |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Assets | 5,199 | 10,738
PCBA |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Assets | 4,829 | 4,182
Recoverable property losses |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Assets | 2,791 | 3,121
Other regulatory assets |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total Regulatory Assets | $ 9,839 | $ 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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