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REGULATORY ASSETS AND LIABILITIES - Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Regulatory Assets and Liabilities |  |
Regulatory Assets | $ 325,376 | $ 433,322
Regulatory Liabilities | 180,718 | 211,413
Future tax benefits due to customers |  |
Regulatory Assets and Liabilities |  |
Regulatory Liabilities | 151,011 | 194,501
Retiree group health |  |
Regulatory Assets and Liabilities |  |
Regulatory Liabilities | 18,472 | 0
HCBA |  |
Regulatory Assets and Liabilities |  |
Regulatory Liabilities | 5,320 | 4,271
Conservation program |  |
Regulatory Assets and Liabilities |  |
Regulatory Liabilities | 3,837 | 2,742
Net WRAM and MCBA long-term payable |  |
Regulatory Assets and Liabilities |  |
Regulatory Liabilities | 479 | 211
1,2,3 trichloropropane settlement proceeds |  |
Regulatory Assets and Liabilities |  |
Regulatory Liabilities | 0 | 8,426
Other regulatory liabilities |  |
Regulatory Assets and Liabilities |  |
Regulatory Liabilities | 1,599 | 1,262
Pension and retiree group health |  |
Regulatory Assets and Liabilities |  |
Regulatory Assets | 59,588 | 208,321
Property-related temporary differences (tax benefits flowed through to customers) |  |
Regulatory Assets and Liabilities |  |
Regulatory Assets | 120,365 | 104,931
Other accrued benefits |  |
Regulatory Assets and Liabilities |  |
Regulatory Assets | 21,692 | 20,030
Net WRAM and MCBA long-term accounts receivable |  |
Regulatory Assets and Liabilities |  |
Regulatory Assets | 33,136 | 25,465
Asset retirement obligations, net |  |
Regulatory Assets and Liabilities |  |
Regulatory Assets | 21,110 | 19,567
IRMA long-term accounts receivable |  |
Regulatory Assets and Liabilities |  |
Regulatory Assets | $ 14,705 | 4,642
Tank coating |  |
Regulatory Assets and Liabilities |  |
Recovery Period | 10 years |
Regulatory Assets | $ 14,018 | 13,535
Recoverable property losses |  |
Regulatory Assets and Liabilities |  |
Recovery Period | 9 years |
Regulatory Assets | $ 4,531 | 5,000
PCBA |  |
Regulatory Assets and Liabilities |  |
Recovery Period | 1 year |
Regulatory Assets | $ 19,647 | 21,465
Other components of net periodic benefit cost |  |
Regulatory Assets and Liabilities |  |
Regulatory Assets | $ 6,736 | 5,145
General district balancing account receivable |  |
Regulatory Assets and Liabilities |  |
Recovery Period | 1 year |
Regulatory Assets | $ 1,830 | 425
Other regulatory assets |  |
Regulatory Assets and Liabilities |  |
Regulatory Assets | $ 2,708 | 4,009
Low Income Rate Assistance And Rate Support Fund Accounts Receivable |  |
Regulatory Assets and Liabilities |  |
Recovery Period | 1 year |
Regulatory Assets | $ 5,310 | $ 787
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 | 2 years |

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