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Completion of Electric Utility Reorganization Plan (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 01, 2020 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on transfer of net assets | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Electric |  |  |  |  |  |  |  |  |  |  |  | $ 37,024,000 | $ 39,548,000 | $ 34,350,000
Net Income |  | $ 20,211,000 | $ 26,530,000 | $ 25,612,000 | $ 14,072,000 | $ 16,700,000 | $ 28,006,000 | $ 26,784,000 | $ 12,852,000 |  |  | 86,425,000 | 84,342,000 | 63,871,000
Net cash provided from operating activities |  |  |  |  |  |  |  |  |  |  |  | 122,170,000 | 116,864,000 | 136,774,000
Net cash used in investing activities (capital expenditures) |  |  |  |  |  |  |  |  |  |  |  | (131,610,000) | (153,195,000) | (128,042,000)
Net cash provided from financing activities |  |  |  |  |  |  |  |  |  |  |  | 44,843,000 | 30,524,000 | (1,805,000)
Maximum borrowing capacity |  | 260,000,000.0 |  |  |  |  |  |  |  | $ 260,000,000.0 |  | $ 260,000,000.0 |  |
Revision of Prior Period, Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  | 3,700,000 |  |  |  |  |  |  |  |
Bear Valley Electric Service, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on transfer of net assets | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax liability | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  |  |  |  |  |  |  | 3 years |  | 3 years |  |
Maximum borrowing capacity | 35,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of amount outstanding |  | 20,200,000 |  |  |  |  |  |  |  | $ 20,200,000 |  | $ 20,200,000 |  |
Incremental expansion of borrowing capacity | 35,000,000.0 | 15,000,000.0 |  |  |  |  |  |  |  | 15,000,000.0 |  | 15,000,000.0 |  |
Dividends |  | 12,400,000 |  |  |  |  |  |  |  |  |  |  |  |
Bear Valley Electric Service, Inc. | Electric |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric |  |  |  |  |  |  |  |  |  | 18,377,000 |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  |  | 13,074,000 |  |  |  |
Operating income |  |  |  |  |  |  |  |  |  | 5,303,000 |  |  |  |
Net Income |  |  |  |  |  |  |  |  |  | 3,870,000 |  |  |  |
Net cash provided from operating activities |  |  |  |  |  |  |  |  |  | 1,887,000 |  |  |  |
Net cash used in investing activities (capital expenditures) |  |  |  |  |  |  |  |  |  | (9,339,000) |  |  |  |
Net cash provided from financing activities |  |  |  |  |  |  |  |  |  | 7,799,000 |  |  |  |
Net change in cash and cash equivalents |  |  |  |  |  |  |  |  |  | 347,000 |  |  |  |
Cash and cash equivalents, end of period | 20,000 | 367,000 |  |  |  |  |  |  |  | $ 367,000 |  | 367,000 |  |
GSWC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric |  |  |  |  |  |  |  |  |  |  |  | 18,647,000 | 39,548,000 | 34,350,000
Net Income |  | $ 11,707,000 | $ 21,143,000 | $ 20,919,000 | $ 11,202,000 | $ 11,981,000 | $ 23,362,000 | $ 22,298,000 | $ 9,022,000 |  |  | 64,971,000 | 66,663,000 | 48,012,000
Net cash provided from operating activities |  |  |  |  |  |  |  |  |  |  |  | 110,337,000 | 96,628,000 | 120,439,000
Net cash used in investing activities (capital expenditures) |  |  |  |  |  |  |  |  |  |  |  | (117,684,000) | (144,188,000) | (117,898,000)
Net cash provided from financing activities |  |  |  |  |  |  |  |  |  |  |  | 42,524,000 | 43,774,000 | $ 1,432,000
Dividends |  |  |  |  |  |  |  |  |  |  |  | $ 71,344,000 |  |
GSWC | Electric |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric |  |  |  |  |  |  |  |  |  |  | $ 21,510,000 |  | $ 2,510,000 |
Operating expenses |  |  |  |  |  |  |  |  |  |  | 13,153,000 |  |  |
Operating income |  |  |  |  |  |  |  |  |  |  | 8,357,000 |  |  |
Net Income |  |  |  |  |  |  |  |  |  |  | $ 5,422,000 |  |  |
Bear Valley Electric Service, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net assets transferred | $ 71,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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