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Completion of Electric Utility Reorganization Plan (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jul. 01, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Completion of Electric Utility Reorganization Plan[Line Items] |  |  |  |  |  |  |  |  |
Gain (loss) on asset transfer | $ 0 |  |  |  |  |  |  |  |
Electric |  | $ 8,288 |  |  | $ 11,996 |  |  | $ 26,935 | $ 30,033
Net income |  | $ 26,530 | $ 25,612 | $ 14,072 | 28,006 | $ 26,784 | $ 12,852 | 66,214 | 67,642
Net cash provided from operating activities |  |  |  |  |  |  |  | 87,843 | 84,304
Net cash used in investing activities |  |  |  |  |  |  |  | (94,637) | (110,672)
Net cash provided from financing activities (2) |  |  |  |  |  |  |  | 13,587 | 29,625
Revision of Prior Period, Adjustment [Member] |  |  |  |  |  |  |  |  |
Completion of Electric Utility Reorganization Plan[Line Items] |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  | 3,700 |  |  |  |
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] |  |  |  |  |  |  |  |  |
Debt instrument term |  | 3 years |  |  |  |  |  |  |
Maximum borrowing capacity on line of credit | 35,000 |  |  |  |  |  |  |  |
Outstanding borrowings |  | $ 3,000 |  |  |  |  |  | 3,000 |
Incremental expansion of borrowing capacity | 15,000 |  |  |  |  |  |  |  |
Taxes Payable | 0 |  |  |  |  |  |  |  |
Bear Valley Electric Service, Inc. | Electric Service Utility Operations |  |  |  |  |  |  |  |  |
Completion of Electric Utility Reorganization Plan[Line Items] |  |  |  |  |  |  |  |  |
Electric |  | 8,288 |  |  |  |  |  |  |
Operating expenses |  | 6,423 |  |  |  |  |  |  |
Operating income |  | 1,865 |  |  |  |  |  |  |
Net income |  | 1,308 |  |  |  |  |  |  |
Net cash provided from operating activities |  | 603 |  |  |  |  |  |  |
Net cash used in investing activities |  | (3,039) |  |  |  |  |  |  |
Net cash provided from financing activities (2) |  | 2,999 |  |  |  |  |  |  |
Net change in cash and cash equivalents |  | 563 |  |  |  |  |  |  |
Cash and cash equivalents, end of period | $ 20 | 583 |  |  |  |  |  | 583 |
Golden State Water Company |  |  |  |  |  |  |  |  |
Completion of Electric Utility Reorganization Plan[Line Items] |  |  |  |  |  |  |  |  |
Electric |  | 0 |  |  | 11,996 |  |  | 18,647 | 30,033
Net income |  | 21,143 | $ 20,919 | $ 11,202 | $ 23,362 | $ 22,298 | $ 9,022 | 53,264 | 54,682
Net cash provided from operating activities |  |  |  |  |  |  |  | 75,093 | 68,956
Net cash used in investing activities |  |  |  |  |  |  |  | (87,529) | (104,429)
Net cash provided from financing activities (2) |  |  |  |  |  |  |  | $ 16,108 | $ 35,739
Golden State Water Company | Electric Service Utility Operations |  |  |  |  |  |  |  |  |
Completion of Electric Utility Reorganization Plan[Line Items] |  |  |  |  |  |  |  |  |
Electric |  | 11,996 |  |  |  |  |  |  |
Operating expenses |  | 6,324 |  |  |  |  |  |  |
Operating income |  | 5,672 |  |  |  |  |  |  |
Net income |  | $ 3,779 |  |  |  |  |  |  |

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