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Business Segments 2 (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting [Abstract] |  |  |
Total utility plant | $ 1,296,310 | $ 1,204,992 | $ 1,150,926
Other assets | 205,123 | 211,742 |
Total Assets | 1,501,433 | 1,416,734 |
Parent Company |  |  |
Segment Reporting [Abstract] |  |  |
Total utility plant | 0 | 0 | 0
Total Assets | 659,205 | 593,757 |
GSWC |  |  |
Segment Reporting [Abstract] |  |  |
Total utility plant | 1,281,092 | 1,197,940 |
Total Assets | 1,389,222 | 1,326,823 |
Segment Reporting Information [Line Items] |  |  |
Depreciation on transportation equipment | 238 | 242 | 259
Contracted Services [Member] | American States Utility Services [Member] |  |  |
Segment Reporting [Abstract] |  |  |
Total utility plant | $ 15,218 | $ 7,052 | $ 5,615

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets except utility plant that are recognized. + References No definition available. + Details
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