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Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 19 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2021 | Apr. 01, 2020 | Dec. 31, 2019
Regulatory Assets and Liabilities |  |  |  |
Total Regulatory Assets | $ 442,819 |  |  | $ 433,322
Total Regulatory Liabilities | 210,267 |  |  | 211,413
Short-term portion of the regulatory assets | 24,970 |  |  | 38,225
Short-term portion of the regulatory liabilities | 3,474 |  |  | 4,462
Property-related temporary differences (tax benefits flowed through to customers) |  |  |  |
Regulatory Assets and Liabilities |  |  |  |
Total Regulatory Liabilities | 194,459 |  |  | 194,501
HCBA |  |  |  |
Regulatory Assets and Liabilities |  |  |  |
Total Regulatory Liabilities | 4,271 |  |  | 4,271
CEBA |  |  |  |
Regulatory Assets and Liabilities |  |  |  |
Total Regulatory Liabilities | 559 |  |  | 2,742
Net WRAM and MCBA long-term payable |  |  |  |
Regulatory Assets and Liabilities |  |  |  |
Total Regulatory Liabilities | 135 |  |  | 211
Tax accounting memorandum account |  |  |  |
Regulatory Assets and Liabilities |  |  |  |
Total Regulatory Liabilities | 853 |  |  | 806
Cost of capital memorandum account |  |  |  |
Regulatory Assets and Liabilities |  |  |  |
Total Regulatory Liabilities | 154 |  |  | 151
1,2,3 trichloropropane (TCP) settlement proceeds |  |  |  |
Regulatory Assets and Liabilities |  |  |  |
Total Regulatory Liabilities | 9,491 |  |  | 8,426
Other regulatory liabilities |  |  |  |
Regulatory Assets and Liabilities |  |  |  |
Total Regulatory Liabilities | 345 |  |  | 305
Pension and retiree group health |  |  |  |
Regulatory Assets and Liabilities |  |  |  |
Total Regulatory Assets | 208,157 |  |  | 208,321
Property-related temporary differences (tax benefits flowed through to customers) |  |  |  |
Regulatory Assets and Liabilities |  |  |  |
Total Regulatory Assets | 105,600 |  |  | 104,931
Other accrued benefits |  |  |  |
Regulatory Assets and Liabilities |  |  |  |
Total Regulatory Assets | 20,885 |  |  | 20,030
Net WRAM and MCBA long-term accounts receivable |  |  |  |
Regulatory Assets and Liabilities |  |  |  |
Total Regulatory Assets | 31,693 |  |  | 25,465
Asset retirement obligations, net |  |  |  |
Regulatory Assets and Liabilities |  |  |  |
Total Regulatory Assets | $ 20,045 |  |  | 19,567
Interim rates long-term accounts receivable |  |  |  |
Regulatory Assets and Liabilities |  |  |  |
Recovery Period | 1 year |  |  |
Total Regulatory Assets | $ 4,642 |  |  | 4,642
Tank coating |  |  |  |
Regulatory Assets and Liabilities |  |  |  |
Recovery Period | 10 years |  |  |
Total Regulatory Assets | $ 14,426 |  |  | 13,535
Recoverable property losses |  |  |  |
Regulatory Assets and Liabilities |  |  |  |
Recovery Period | 10 years |  |  |
Total Regulatory Assets | $ 4,856 |  |  | 5,000
PCBA |  |  |  |
Regulatory Assets and Liabilities |  |  |  |
Recovery Period | 1 year |  |  |
Total Regulatory Assets | $ 21,465 |  |  | 21,465
Other components of net periodic benefit cost |  |  |  |
Regulatory Assets and Liabilities |  |  |  |
Total Regulatory Assets | 5,503 |  |  | 5,145
Other regulatory assets |  |  |  |
Regulatory Assets and Liabilities |  |  |  |
Total Regulatory Assets | $ 5,547 |  |  | $ 5,221
Minimum | Net WRAM and MCBA 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 |  |  |
Forecast |  |  |  |
Regulatory Assets and Liabilities |  |  |  |
Amount of construction work in process included in rate base |  | $ 148,000 |  |
Forecast | 2019-2021 | Minimum |  |  |  |
Regulatory Assets and Liabilities |  |  |  |
Amount of construction work in process included in rate base |  |  | $ 609,000 |
Payments for Capital Improvements |  | 809,000 |  |
Forecast | 2019-2021 | Maximum |  |  |  |
Regulatory Assets and Liabilities |  |  |  |
Amount of construction work in process included in rate base |  |  | 628,000 |
Payments for Capital Improvements |  | $ 828,000 |  |
Forecast | 2018 |  |  |  |
Regulatory Assets and Liabilities |  |  |  |
Amount of construction work in process included in rate base |  |  | $ 200,000 |

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