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Stock-Based Compensation Plans 2 (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Additional disclosure |  |  |
Vesting period | 3 years |  |
Unrecognized compensation cost | $ 400 |  |
Weighted Average Grant-Date Value |  |  |
Capitalized equity-based compensation cost | $ 400 | $ 500 | $ 300
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 | $ 700 |  |
Number of Restricted/Performance Share Units |  |  |
Restricted share units at the beginning of the period (in shares) | 50,327 |  |
Granted (in shares) | 27,051 |  |
Vested (in shares) | (18,301) |  |
Forfeited (in shares) | (786) |  |
Restricted share units at the end of the period (in shares) | 58,291 | 50,327 |
Weighted Average Grant-Date Value |  |  |
Restricted share units at the beginning of the period (in dollars per share) | $ 54.00 |  |
Granted (in dollars per share) | 74.02 |  |
Vested (in dollars per share) | 86.27 |  |
Forfeited (in dollars per share) | 80.70 |  |
Restricted share units at the end of the period (in dollars per share) | $ 52.80 | $ 54.00 |
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) | 65,357 |  |
Granted (in shares) | 28,503 |  |
Performance criteria adjustment (in shares) | 15,251 |  |
Vested (in shares) | (22,603) |  |
Restricted share units at the end of the period (in shares) | 86,508 | 65,357 |
Weighted Average Grant-Date Value |  |  |
Restricted share units at the beginning of the period (in dollars per share) | $ 87.35 |  |
Granted (in dollars per share) | 73.16 |  |
Performance criteria adjustment (in dollars per share) | 83.31 |  |
Vested (in dollars per share) | 79.54 |  |
Restricted share units at the end of the period (in dollars per share) | $ 84.00 | $ 87.35 |
Performance awards | 2000 and 2008 Employee Plans |  |  |
Additional disclosure |  |  |
Vesting period | 3 years |  |
GSWC |  |  |
Weighted Average Grant-Date Value |  |  |
Capitalized equity-based compensation cost | $ 400 | $ 500 | $ 300
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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