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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of share-based compensation expenses | These expenses resulting from stock options, restricted stock units and performance awards are included in administrative and general expenses in AWR and GSWC’s statements of income:
|  | AWR |  | GSWC
|  | For The Years Ended December 31, |  | For The Years Ended December 31,
(in thousands) |  | 2014 |  | 2013 |  | 2012 |  | 2014 |  | 2013 |  | 2012
Stock-based compensation related to: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options |  | $ | — |  |  | $ | 9 |  |  | $ | 150 |  |  | $ | — |  |  | $ | 8 |  |  | $ | 147 |
Restricted stock units |  | 1,354 |  |  | 1,507 |  |  | 1,729 |  |  | 1,113 |  |  | 1,266 |  |  | 1,468 |
Performance awards |  | 868 |  |  | 493 |  |  | 52 |  |  | 635 |  |  | 373 |  |  | 52 |
Total stock-based compensation expense |  | $ | 2,222 |  |  | $ | 2,009 |  |  | $ | 1,931 |  |  | $ | 1,748 |  |  | $ | 1,647 |  |  | $ | 1,667 |
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, 2014, and changes during the year ended December 31, 2014, is presented below:
| Number of Performance awards |  | Weighted Average Grant-Date Value
Performance awards at January 1, 2014 | 40,920 |  |  | $ | 25.63 |
Granted | 38,948 |  |  | 29.10 |
Vested | (4,041 | ) |  | 18.68 |
Performance awards at December 31, 2014 | 75,827 |  |  | $ | 27.78 |
Summary of stock option activity | A summary of stock option activity as of December 31, 2014 and changes during the year ended December 31, 2014, are presented below:
| Number of Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value
Options outstanding at January 1, 2014 | 264,596 |  |  | $ | 17.16 |  |  |  |  |  |
Granted | — |  |  |  |  |  |  |  |  |
Exercised | (37,006 | ) |  | 15.93 |  |  |  |  |  |
Forfeited or expired | (5,010 | ) |  | 12.77 |  |  |  |  |  |
Options outstanding at December 31, 2014 | 222,580 |  |  | $ | 17.47 |  |  | 3 |  | $ | 4,494,733 |
Options exercisable at December 31, 2014 | 222,580 |  |  | $ | 17.47 |  |  | 3 |  | $ | 4,494,733 |
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, 2014, and changes during the year ended December 31, 2014, is presented below:
| Number of Restricted Share Units |  | Weighted Average Grant-Date Value
Restricted share units at January 1, 2014 | 197,036 |  |  | $ | 19.04 |
Granted | 56,059 |  |  | 29.05 |
Vested | (103,580 | ) |  | 20.62 |
Forfeited | (4,040 | ) |  | 25.08 |
Restricted share units at December 31, 2014 | 145,475 |  |  | $ | 21.61 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number, aggregate intrinsic value (except for nonpublic entities), and weighted-average remaining contractual term for both performance-based awards (or share units) outstanding and performance-based awards (or share units) fully vested and expected to vest at the date of the latest statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&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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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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