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Utility Plant and Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Utility plant utilized in continuing operations by major asset class |  |  |
Total amortized intangible assets | $ 31,192 | $ 37,678 |
Total utility plant, at cost | 1,674,527 | 1,620,325 |
Less - accumulated depreciation | (533,370) | (532,753) |
Construction work in progress | (63,835) | (63,354) |
Net utility plant | 1,204,992 | 1,150,926 | $ 1,060,794
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 |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 1,574,801 | 1,526,316 |
Water | Land |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 14,895 | 15,393 |
Water | Intangible Assets [Member] |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 29,396 | 36,291 |
Water | Source of water supply |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 88,168 | 86,775 |
Water | Pumping |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 178,252 | 169,983 |
Water | Water treatment |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 78,999 | 74,980 |
Water | Transmission and distribution |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 1,064,271 | 1,014,925 |
Water | General |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 120,820 | 127,969 |
Electric |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 99,726 | 94,009 |
Electric | Intangible Assets [Member] |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 1,200 | 1,200 |
Electric | Transmission and distribution |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 76,188 | 71,112 |
Electric | Generation |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 12,583 | 12,583 |
Electric | General |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 10,955 | 10,314 |
GSWC |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total amortized intangible assets | 30,621 | 37,107 |
Total utility plant, at cost | 1,658,935 | 1,608,428 |
Less - accumulated depreciation | (524,481) | (524,927) |
Construction work in progress | (63,486) | (61,810) |
Net utility plant | 1,197,940 | 1,145,311 |
GSWC | Water |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 1,559,209 | 1,514,419 |
Net utility plant | 1,137,995 | 1,089,031 | 1,005,114
GSWC | Water | Land |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 14,895 | 15,393 |
GSWC | Water | Intangible Assets [Member] |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 29,378 | 36,273 |
GSWC | Water | Source of water supply |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 88,168 | 86,775 |
GSWC | Water | Pumping |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 178,252 | 169,983 |
GSWC | Water | Water treatment |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 78,999 | 74,980 |
GSWC | Water | Transmission and distribution |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 1,064,271 | 1,014,925 |
GSWC | Water | General |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 105,246 | 116,090 |
GSWC | Electric |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 99,726 | 94,009 |
Net utility plant | 59,945 | 56,280 | $ 51,002
GSWC | Electric | Transmission and distribution |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 76,188 | 71,112 |
GSWC | Electric | Generation |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 12,583 | 12,583 |
GSWC | Electric | General |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 10,955 | 10,314 |
Conservation [Member] |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total amortized intangible assets | 9,486 | 9,496 |
Conservation [Member] | GSWC |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total amortized intangible assets | $ 9,486 | $ 9,496 |

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