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Completion of Electric Utility Reorganization Plan (Details) - USD ($) $ in Thousands |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 01, 2020 | Dec. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Operating revenues |  |  |  | $ 498,853 | $ 488,243 | $ 473,869
Net Income |  |  |  | 94,347 | 86,425 | 84,342
Net cash provided from operating activities |  |  |  | 115,584 | 122,170 | 116,864
Net cash used in investing activities (capital expenditures) |  |  |  | (145,092) | (131,610) | (153,195)
Net cash provided from financing activities |  |  |  | (2,266) | 44,843 | 30,524
Cash and cash equivalents, beginning of the year |  |  | $ 1,334 | 36,737 | 1,334 | 7,141
Cash and cash equivalents, end of year |  | $ 36,737 |  | 4,963 | 36,737 | 1,334
Bear Valley Electric Service, Inc. |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Net assets transferred | $ 71,300 |  |  |  |  |
Bear Valley Electric Service, Inc. |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | 35,000 |  |
Notes Payable |  |  |  | 31,000 |  |
Incremental expansion of borrowing capacity | 35,000 |  |  | 15,000 |  |
Bear Valley Electric Service, Inc. | Electric |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Operating revenues |  | 18,377 |  | 38,345 |  |
Operating expenses |  | 13,074 |  | 27,607 |  |
Operating income |  | 5,303 |  | 10,738 |  |
Net Income |  | 3,870 |  | 7,864 |  |
Net cash provided from operating activities |  | 1,887 |  | 9,128 |  |
Net cash used in investing activities (capital expenditures) |  | (9,339) |  | (19,859) |  |
Net cash provided from financing activities |  | 7,799 |  | 10,827 |  |
Cash and Cash Equivalents, Period Increase (Decrease), Total |  | 347 |  | 96 |  |
Cash and cash equivalents, beginning of the year |  |  |  | 367 |  |
Cash and cash equivalents, end of year | $ 20 | 367 |  | 463 | 367 |
GSWC |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Operating revenues |  |  |  | 347,112 | 349,284 | 359,378
Net Income |  |  |  | 69,215 | 64,971 | 66,663
Net cash provided from operating activities |  |  |  | 100,294 | 110,337 | 96,628
Net cash used in investing activities (capital expenditures) |  |  |  | (124,259) | (117,684) | (144,188)
Net cash provided from financing activities |  |  |  | (11,088) | 42,524 | 43,774
Cash and cash equivalents, beginning of the year |  |  | 401 | 35,578 | 401 | 4,187
Cash and cash equivalents, end of year |  | $ 35,578 |  | $ 525 | 35,578 | 401
GSWC | Electric |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Operating revenues |  |  | 18,647 |  | 37,024 | $ 39,548
Operating expenses |  |  | 13,647 |  |  |
Operating income |  |  | 5,000 |  |  |
Net Income |  |  | $ 3,408 |  |  |
Golden State Water Company and Bear Valley Electric Service, Inc. [Member] | Electric |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Operating revenues |  |  |  |  | 37,024 |
Operating expenses |  |  |  |  | 26,721 |
Operating income |  |  |  |  | 10,303 |
Net Income |  |  |  |  | $ 7,278 |

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