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Stock-Based Compensation Plans 2 (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Additional disclosure |  |  |
Vesting period | 3 years |  |
Unrecognized compensation cost | $ 272 |  |
Weighted Average Grant-Date Value |  |  |
Capitalized equity-based compensation cost | $ 450 | $ 290 | $ 336
Maximum |  |  |
Additional disclosure |  |  |
Percentage of target amount of performance shares | 200.00% |  |
Minimum |  |  |
Additional disclosure |  |  |
Percentage of target amount of performance shares | 0.00% |  |
Weighted Average |  |  |
Additional disclosure |  |  |
Expected recognition period for unrecognized compensation cost | 1 year 6 months |  |
Restricted Stock Units |  |  |
Additional disclosure |  |  |
Unrecognized compensation cost related to performance awards | $ 622 |  |
Number of Restricted/Performance Share Units |  |  |
Restricted share units at the beginning of the period (in shares) | 47,552 |  |
Granted (in shares) | 19,837 |  |
Vested (in shares) | (16,574) |  |
Forfeited (in shares) | (488) |  |
Restricted share units at the end of the period (in shares) | 50,327 | 47,552 |
Weighted Average Grant-Date Value |  |  |
Restricted share units at the beginning of the period (in dollars per share) | $ 49.01 |  |
Granted (in dollars per share) | 94.71 |  |
Vested (in dollars per share) | 87.28 |  |
Forfeited (in dollars per share) | 92.84 |  |
Restricted share units at the end of the period (in dollars per share) | $ 54.00 | $ 49.01 |
Performance awards |  |  |
Additional disclosure |  |  |
Vesting period | 3 years |  |
Period to meet the performance goals | 3 years |  |
Number of Restricted/Performance Share Units |  |  |
Restricted share units at the beginning of the period (in shares) | 49,435 |  |
Granted (in shares) | 19,696 |  |
Performance criteria adjustment (in shares) | 8,321 |  |
Vested (in shares) | (12,095) |  |
Restricted share units at the end of the period (in shares) | 65,357 | 49,435 |
Weighted Average Grant-Date Value |  |  |
Restricted share units at the beginning of the period (in dollars per share) | $ 83.70 |  |
Granted (in dollars per share) | 96.04 |  |
Performance criteria adjustment (in dollars per share) | 91.73 |  |
Vested (in dollars per share) | 89.59 |  |
Restricted share units at the end of the period (in dollars per share) | $ 87.35 | $ 83.70 |
Performance awards | 2000 and 2008 Employee Plans |  |  |
Additional disclosure |  |  |
Vesting period | 3 years |  |
GSWC |  |  |
Weighted Average Grant-Date Value |  |  |
Capitalized equity-based compensation cost | $ 450 | $ 290 | $ 336
American States Utility Services | Maximum |  |  |
Additional disclosure |  |  |
Percentage of target amount of performance shares | 250.00% |  |

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- Definition Amount of cost capitalized for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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