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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of share-based compensation expenses | The following table presents share-based compensation expenses for the years ended December 31, 2019, 2018 and 2017. 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) |  | 2019 |  | 2018 |  | 2017 |  | 2019 |  | 2018 |  | 2017
Stock-based compensation related to: |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock units |  | $ | 2,517 |  |  | $ | 3,851 |  |  | $ | 2,885 |  |  | $ | 2,253 |  |  | $ | 3,397 |  |  | $ | 2,420 |
Total stock-based compensation expense |  | $ | 2,517 |  |  | $ | 3,851 |  |  | $ | 2,885 |  |  | $ | 2,253 |  |  | $ | 3,397 |  |  | $ | 2,420 |
Schedule of assumptions used to estimate fair value of each option grant on the grant date using the Black-Scholes option-pricing model | will be earned based on Registrant’s TSR compared to the TSR for a specific peer group of investor-owned water companies. A summary of the status of Registrant’s outstanding performance awards to officers as of December 31, 2019, and changes during the year ended December 31, 2019, is presented below:
| Number of Performance awards |  | Weighted Average Grant-Date Value
Performance awards at January 1, 2019 | 95,661 |  |  | $ | 45.36 |
Granted | 22,035 |  |  | 65.86 |
Performance criteria adjustment | 1,772 |  |  | 38.14 |
Vested | (33,080 | ) |  | 41.15 |
Forfeited | (1,739 | ) |  | 61.74 |
Performance awards at December 31, 2019 | 84,649 |  |  | $ | 51.85 |
Summary of stock option activity |
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, 2019, and changes during the year ended December 31, 2019, is presented below:
| Number of Restricted Share Units |  | Weighted Average Grant-Date Value
Restricted share units at January 1, 2019 | 102,235 |  |  | $ | 34.73 |
Granted | 23,550 |  |  | 67.57 |
Vested | (48,017 | ) |  | 30.99 |
Forfeited | (2,697 | ) |  | 48.64 |
Restricted share units at December 31, 2019 | 75,071 |  |  | $ | 46.92 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + 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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