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v3.19.3.a.u2

Business Segments 2 (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting [Abstract] |  |  |
Total utility plant | $ 1,415,705 | $ 1,296,310 | $ 1,204,992
Other assets | 225,626 | 205,123 |
Total Assets | 1,641,331 | 1,501,433 |
Parent Company |  |  |
Segment Reporting [Abstract] |  |  |
Total utility plant | 0 | 0 | 0
Total Assets | 811,677 | 659,205 |
GSWC |  |  |
Segment Reporting [Abstract] |  |  |
Total utility plant | 1,394,742 | 1,281,092 |
Total Assets | 1,522,454 | 1,389,222 |
Segment Reporting Information [Line Items] |  |  |
Depreciation on transportation equipment | 316 | 238 | 242
Contracted services: | American States Utility Services [Member] |  |  |
Segment Reporting [Abstract] |  |  |
Total utility plant | $ 20,963 | $ 15,218 | $ 7,052

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