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Business Segments 2 (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting [Abstract] |  |  |
Total utility plant | $ 1,626,004 | $ 1,512,043 | $ 1,415,705
Other assets | 274,979 | 279,560 |
Total Assets | 1,900,983 | 1,791,603 |
Parent Company |  |  |
Segment Reporting [Abstract] |  |  |
Total utility plant | 0 | 0 | 0
Total Assets | 864,144 | 759,716 |
GSWC |  |  |
Segment Reporting [Abstract] |  |  |
Total utility plant | 1,499,745 | 1,400,489 |
Total Assets | 1,638,482 | 1,560,782 |
Segment Reporting Information [Line Items] |  |  |
Depreciation on transportation equipment | 379 | 353 | 316
Contracted services: | American States Utility Services |  |  |
Segment Reporting [Abstract] |  |  |
Total utility plant | $ 19,751 | $ 22,246 | $ 20,963

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