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Utility Plant and Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Utility plant utilized in continuing operations by major asset class |  |  |
Total amortized intangible assets | $ 30,822 | $ 31,192 |
Total utility plant, at cost | 1,780,110 | 1,674,527 |
Less - accumulated depreciation | (561,855) | (533,370) |
Construction work in progress | (78,055) | (63,835) |
Net utility plant | 1,296,310 | 1,204,992 | $ 1,150,926
American States Utility Services [Member] | Intangible Assets [Member] |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 571 | 571 |
Water Service Utility Operations [Member] |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 1,674,046 | 1,574,801 |
Water Service Utility Operations [Member] | Land |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 14,890 | 14,895 |
Water Service Utility Operations [Member] | Intangible Assets [Member] |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 29,412 | 29,396 |
Water Service Utility Operations [Member] | Source of water supply |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 91,349 | 88,168 |
Water Service Utility Operations [Member] | Pumping |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 182,673 | 178,252 |
Water Service Utility Operations [Member] | Water treatment |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 82,198 | 78,999 |
Water Service Utility Operations [Member] | Transmission and distribution |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 1,142,105 | 1,064,271 |
Water Service Utility Operations [Member] | General |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 131,419 | 120,820 |
Electric Service Utility Operations [Member] |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 106,064 | 99,726 |
Electric Service Utility Operations [Member] | Intangible Assets [Member] |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 1,200 | 1,200 |
Electric Service Utility Operations [Member] | Transmission and distribution |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 82,257 | 76,188 |
Electric Service Utility Operations [Member] | Generation |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 12,583 | 12,583 |
Electric Service Utility Operations [Member] | General |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 11,224 | 10,955 |
GSWC |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total amortized intangible assets | 30,251 | 30,621 |
Total utility plant, at cost | 1,755,599 | 1,658,935 |
Less - accumulated depreciation | (551,244) | (524,481) |
Construction work in progress | (76,737) | (63,486) |
Net utility plant | 1,281,092 | 1,197,940 |
GSWC | Water Service Utility Operations [Member] |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 1,649,535 | 1,559,209 |
Net utility plant | 1,218,468 | 1,137,995 | 1,089,031
GSWC | Water Service Utility Operations [Member] | Land |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 14,890 | 14,895 |
GSWC | Water Service Utility Operations [Member] | Intangible Assets [Member] |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 29,413 | 29,378 |
GSWC | Water Service Utility Operations [Member] | Source of water supply |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 91,349 | 88,168 |
GSWC | Water Service Utility Operations [Member] | Pumping |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 182,673 | 178,252 |
GSWC | Water Service Utility Operations [Member] | Water treatment |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 82,198 | 78,999 |
GSWC | Water Service Utility Operations [Member] | Transmission and distribution |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 1,142,105 | 1,064,271 |
GSWC | Water Service Utility Operations [Member] | General |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 106,907 | 105,246 |
GSWC | Electric Service Utility Operations [Member] |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 106,064 | 99,726 |
Net utility plant | 62,624 | 59,945 | $ 56,280
GSWC | Electric Service Utility Operations [Member] | Transmission and distribution |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 82,257 | 76,188 |
GSWC | Electric Service Utility Operations [Member] | Generation |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 12,583 | 12,583 |
GSWC | Electric Service Utility Operations [Member] | General |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 11,224 | 10,955 |
Conservation [Member] |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total amortized intangible assets | 9,486 | 9,486 |
Conservation [Member] | GSWC |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total amortized intangible assets | $ 9,486 | $ 9,486 |

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