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Completion of Electric Utility Reorganization Plan (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 01, 2020 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Oct. 30, 2020
Completion of Electric Utility Reorganization Plan[Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on asset transfer | $ 0 |  |  |  |  |  |  |  |  |  |
Electric |  | $ 8,564 |  |  | $ 8,288 |  |  |  | $ 28,211 | $ 26,935 |
Net income |  | 28,153 | $ 26,576 | $ 19,268 | 26,530 | $ 25,612 | $ 14,072 |  | 73,997 | 66,214 |
Net cash provided from operating activities |  |  |  |  |  |  |  |  | 81,923 | 87,843 |
Net cash used in investing activities |  |  |  |  |  |  |  |  | (106,492) | (94,637) |
Net cash provided from financing activities (1) |  |  |  |  |  |  |  |  | (5,027) | 13,587 |
Incremental expansion of borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 30,000
Bear Valley Electric Service, Inc. |  |  |  |  |  |  |  |  |  |  |
Completion of Electric Utility Reorganization Plan[Line Items] |  |  |  |  |  |  |  |  |  |  |
Net assets transferred | 71,300 |  |  |  |  |  |  |  |  |  |
Bear Valley Electric Service, Inc. |  |  |  |  |  |  |  |  |  |  |
Completion of Electric Utility Reorganization Plan[Line Items] |  |  |  |  |  |  |  |  |  |  |
Taxes Payable | $ 0 |  |  |  |  |  |  |  |  |  |
Debt instrument term | 3 years |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity on line of credit | $ 35,000 |  |  |  |  |  |  |  |  |  |
Outstanding borrowings |  | 28,000 |  |  |  |  |  |  | 28,000 |  |
Incremental expansion of borrowing capacity |  | 15,000 |  |  |  |  |  |  | 15,000 |  |
Bear Valley Electric Service, Inc. | Electric Service Utility Operations |  |  |  |  |  |  |  |  |  |  |
Completion of Electric Utility Reorganization Plan[Line Items] |  |  |  |  |  |  |  |  |  |  |
Electric |  |  |  |  | 8,288 |  |  |  | 28,211 | 26,935 |
Operating expenses |  |  |  |  | 6,423 |  |  |  | 20,915 | 20,070 |
Operating income |  |  |  |  | 1,865 |  |  |  | 7,296 | 6,865 |
Net income |  |  |  |  | 1,308 |  |  |  | 5,310 | 4,717 |
Net cash provided from operating activities |  |  |  |  | 603 |  |  |  | 7,215 |  |
Net cash used in investing activities |  |  |  |  | (3,039) |  |  |  | (15,139) |  |
Net cash provided from financing activities (1) |  |  |  |  | 2,999 |  |  |  | 7,824 |  |
Net change in cash and cash equivalents |  |  |  |  | 563 |  |  |  | (100) |  |
Cash and cash equivalents, beginning of period | $ 20 |  |  | 367 | 20 |  |  |  | 367 |  |
Cash and cash equivalents, end of period |  | 267 |  |  | 583 | 20 |  | $ 20 | 267 | 583 |
Golden State Water Company |  |  |  |  |  |  |  |  |  |  |
Completion of Electric Utility Reorganization Plan[Line Items] |  |  |  |  |  |  |  |  |  |  |
Electric |  | 0 |  |  | 0 |  |  |  | 0 | 18,647 |
Net income |  | $ 22,797 | $ 20,960 | $ 12,231 | $ 21,143 | $ 20,919 | $ 11,202 |  | 55,988 | 53,264 |
Net cash provided from operating activities |  |  |  |  |  |  |  |  | 73,327 | 75,093 |
Net cash used in investing activities |  |  |  |  |  |  |  |  | (90,118) | (87,529) |
Net cash provided from financing activities (1) |  |  |  |  |  |  |  |  | $ (15,828) | $ 16,108 |
Golden State Water Company | Electric Service Utility Operations |  |  |  |  |  |  |  |  |  |  |
Completion of Electric Utility Reorganization Plan[Line Items] |  |  |  |  |  |  |  |  |  |  |
Electric |  |  |  |  |  |  |  | 18,647 |  |  |
Operating expenses |  |  |  |  |  |  |  | 13,647 |  |  |
Operating income |  |  |  |  |  |  |  | 5,000 |  |  |
Net income |  |  |  |  |  |  |  | $ 3,409 |  |  |

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