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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2024
Share-Based Payment Arrangement [Abstract] |
Schedule of share-based compensation expenses | The following table presents share-based compensation expenses for the years ended December 31, 2024, 2023 and 2022. These expenses resulting from restricted stock units, including performance awards, are included in administrative and general expenses in AWR’s and GSWC’s statements of income:
|  | AWR |  | GSWC
|  | For The Years Ended December 31, |  | For The Years Ended December 31,
(in thousands) |  | 2024 |  | 2023 |  | 2022 |  | 2024 |  | 2023 |  | 2022
Stock-based compensation related to: |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock units |  | $ | 3,744 |  |  | $ | 3,298 |  |  | $ | 2,571 |  |  | $ | 3,279 |  |  | $ | 2,994 |  |  | $ | 2,269 |
Total stock-based compensation expense |  | $ | 3,744 |  |  | $ | 3,298 |  |  | $ | 2,571 |  |  | $ | 3,279 |  |  | $ | 2,994 |  |  | $ | 2,269 |
Schedule of assumptions used to estimate fair value of each option grant on the grant date using the Black-Scholes option-pricing model | A summary of the status of Registrant’s outstanding performance awards to officers as of December 31, 2024, and changes during the year ended December 31, 2024, is presented below:
| Number of Performance awards |  | Weighted Average Grant-Date Value
Performance awards at January 1, 2024 | 65,357 |  |  | $ | 87.35 |
Granted | 28,503 |  |  | 73.16 |
Performance criteria adjustment | 15,251 |  |  | 83.31 |
Vested | (22,603) |  |  | 79.54 |
Performance awards at December 31, 2024 | 86,508 |  |  | $ | 84.00 |
Summary of the status of Registrant's outstanding restricted stock units to employees and directors | A summary of the status of Registrant’s outstanding RSUs, excluding performance awards, to employees and directors as of December 31, 2024, and changes during the year ended December 31, 2024, is presented below:
| Number of Restricted Share Units |  | Weighted Average Grant-Date Value
Restricted share units at January 1, 2024 | 50,327 |  |  | $ | 54.00 |
Granted | 27,051 |  |  | 74.02 |
Vested | (18,301) |  |  | 86.27 |
Forfeited | (786) |  |  | 80.70 |
Restricted share units at December 31, 2024 | 58,291 |  |  | $ | 52.80 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding performance-based awards that are fully vested and expected to vest. Includes, but is not limited to, unvested awards for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (e)(1) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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