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Business Segments 2 (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting [Abstract] |  |  |
Total utility plant | $ 1,512,043 | $ 1,415,705 | $ 1,296,310
Other assets | 279,560 | 225,626 |
Total Assets | 1,791,603 | 1,641,331 |
Parent Company |  |  |
Segment Reporting [Abstract] |  |  |
Total utility plant | 0 | 0 | 0
Total Assets | 759,716 | 811,677 |
GSWC |  |  |
Segment Reporting [Abstract] |  |  |
Total utility plant | 1,400,489 | 1,394,742 |
Total Assets | 1,560,782 | 1,522,454 |
Segment Reporting Information [Line Items] |  |  |
Depreciation on transportation equipment | 353 | 316 | 238
Contracted services: | American States Utility Services [Member] |  |  |
Segment Reporting [Abstract] |  |  |
Total utility plant | $ 22,246 | $ 20,963 | $ 15,218

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