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Regulatory Assets and Liabilities - Schedule of Regulatory Assets and Liabilities (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Regulatory Assets and Liabilities    
Total Regulatory Assets $ 328,505 $ 325,376
Total Regulatory Liabilities 186,829 180,718
Future tax benefits due to customers    
Regulatory Assets and Liabilities    
Total Regulatory Liabilities 152,204 151,011
Retiree group health    
Regulatory Assets and Liabilities    
Total Regulatory Liabilities 18,472 18,472
HCBA    
Regulatory Assets and Liabilities    
Total Regulatory Liabilities 8,733 5,320
CEBA    
Regulatory Assets and Liabilities    
Total Regulatory Liabilities 6,210 3,837
Net WRAM and MCBA long-term payable    
Regulatory Assets and Liabilities    
Total Regulatory Liabilities 118 479
Other regulatory liabilities    
Regulatory Assets and Liabilities    
Total Regulatory Liabilities 1,092 1,599
Pension and retiree group health    
Regulatory Assets and Liabilities    
Total Regulatory Assets 59,094 59,588
Future tax benefits due to customers    
Regulatory Assets and Liabilities    
Total Regulatory Assets 124,854 120,365
Other accrued benefits    
Regulatory Assets and Liabilities    
Total Regulatory Assets 22,744 21,692
Net WRAM and MCBA long-term accounts receivable    
Regulatory Assets and Liabilities    
Total Regulatory Assets 34,606 33,136
Asset retirement obligations, net    
Regulatory Assets and Liabilities    
Total Regulatory Assets 22,668 21,110
IRMA long-term accounts receivable    
Regulatory Assets and Liabilities    
Total Regulatory Assets $ 11,614 14,705
Tank coating    
Regulatory Assets and Liabilities    
Recovery Period 10 years  
Total Regulatory Assets $ 13,513 14,018
Recoverable property losses    
Regulatory Assets and Liabilities    
Recovery Period 9 years  
Total Regulatory Assets $ 4,018 4,531
PCBA    
Regulatory Assets and Liabilities    
Recovery Period 1 year  
Total Regulatory Assets $ 21,178 19,647
Other components of net periodic benefit cost    
Regulatory Assets and Liabilities    
Total Regulatory Assets $ 4,255 6,736
General district balancing account receivable    
Regulatory Assets and Liabilities    
Recovery Period 1 year  
Total Regulatory Assets $ 511 1,830
Low-income rate assistance (LIRA) and Rate support fund (RSF) accounts receivable    
Regulatory Assets and Liabilities    
Recovery Period 1 year  
Total Regulatory Assets $ 5,803 5,310
Other regulatory assets    
Regulatory Assets and Liabilities    
Total Regulatory Assets $ 3,647 $ 2,708
Minimum | Net WRAM and MCBA long-term accounts receivable    
Regulatory Assets and Liabilities    
Recovery Period 1 year  
Minimum | IRMA long-term accounts receivable    
Regulatory Assets and Liabilities    
Recovery Period 1 year  
Maximum | Net WRAM and MCBA long-term accounts receivable    
Regulatory Assets and Liabilities    
Recovery Period 2 years  
Maximum | IRMA long-term accounts receivable    
Regulatory Assets and Liabilities    
Recovery Period 3 years