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Regulatory Assets and Liabilities (Tables)
 9 Months Ended
Sep. 30, 2024
Regulated Operations [Abstract]  
Schedule of Regulatory Assets and Liabilities
Regulatory assets and liabilities were comprised of the following as of September 30, 2024 and December 31, 2023:
 Recovery PeriodSeptember 30, 2024December 31, 2023
Regulatory Assets  
Property-related temporary differences (tax benefits flowed through to customers)Indefinite$158,486 $158,486 
IRMA long-term accounts receivableVarious49,505 3,430 
Asset retirement obligations, netIndefinite29,134 26,686 
Other accrued benefitsIndefinite26,663 25,363 
Tank coatingVarious21,345 19,602 
MWRAM
1 - 2 years
14,253 — 
General district balancing account
1 year
10,945 390 
Customer assistance program (CAP) and Rate support fund (RSF) accounts receivable1 year9,056 2,459 
Incremental cost balancing account (ICBA)1 year9,479 — 
Net WRAM and modified cost balancing account (MCBA) long-term accounts receivableVarious4,216 10,738 
Pension cost balancing account (PCBA)Various— 4,182 
Recoverable property lossesVarious2,625 3,121 
Other regulatory assetsVarious4,712 3,164 
Total Regulatory Assets$340,419 $257,621 
Regulatory Liabilities  
Cost of removal$474,264 $447,356 
Future tax benefits due to customers109,491 118,051 
Pension and retiree group health101,984 88,728 
Other components of net periodic benefit cost16,952 10,348 
PCBA14,085 8,972 
ICBA6,517 — 
Health cost balancing account (HCBA)3,979 3,242 
Net WRAM and MCBA long-term payable2,967 2,071 
Conservation Expense Balancing Account2,828 1,200 
RSF regulatory liability— 2,116 
Other regulatory liabilities1,858 1,633 
Total Regulatory Liabilities$734,925 $683,717