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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 |

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