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Equity Plans | 9 Months Ended
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Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
EQUITY PLANS | Equity Plans SJW Corp. accounts for share-based compensation based on the grant date fair value of the awards issued to employees in accordance with FASB ASC Topic 718 - “Compensation - Stock Compensation,” which requires the measurement and recognition of compensation expense based on the estimated fair value for all share-based payment awards. The Incentive Plan allows SJW Corp. to provide employees, non-employee board members or the board of directors of any parent or subsidiary, consultants, and other independent advisors who provide services to the company or any parent or subsidiary the opportunity to acquire an equity interest in SJW Corp. The types of awards included in the Incentive Plan are restricted stock awards, restricted stock units, performance shares, or other share-based awards. As of September 30, 2016, the remaining number of shares available under the Incentive Plan was 993,954, and an additional 229,972 shares were issuable under outstanding restricted stock units and deferred restricted stock units. In addition, shares are issued to employees under the company's ESPP. Stock compensation costs charged to income are recognized on a straight-line basis over the requisite service period. A summary of compensation costs charged to income, proceeds from the exercise of stock options and similar instruments, and the tax benefit realized from stock options and similar instruments exercised, that were recorded to additional paid-in capital and common stock, by award type, are presented below for the three and nine months ended September 30, 2016 and 2015.
| Three months ended September 30, |  | Nine months ended September 30,
| 2016 |  | 2015 |  | 2016 |  | 2015
Adjustments to additional paid-in capital and common stock for: |  |  |  |  |  |  |
Compensation costs charged to income: |  |  |  |  |  |  |
ESPP | $ | 89 |  |  | 82 |  |  | $ | 168 |  |  | 158 |
Restricted stock and deferred restricted stock | 375 |  |  | 365 |  |  | 1,148 |  |  | 1,050 |
Total compensation costs charged to income | $ | 464 |  |  | 447 |  |  | $ | 1,316 |  |  | 1,208 |
Excess tax benefits realized from stock issuance: |  |  |  |  |  |  |
Restricted stock and deferred restricted stock | $ | 1 |  |  | — |  |  | $ | 203 |  |  | 634 |
Total excess tax benefits realized from stock issuance | $ | 1 |  |  | — |  |  | $ | 203 |  |  | 634 |
Proceeds from ESPP and similar instruments: |  |  |  |  |  |  |
ESPP | $ | 503 |  |  | 462 |  |  | $ | 954 |  |  | 895 |
Total proceeds from the ESPP and similar instruments | $ | 503 |  |  | 462 |  |  | $ | 954 |  |  | 895 |
Stock, Restricted Stock and Deferred Restricted Stock On January 4, 2016, service based restricted stock units covering an aggregate of 17,835 shares of common stock of SJW Corp. were granted to certain officers of SJW Corp. and its subsidiaries. The units vest in three equal successive installments upon completion of each year of service with no dividend equivalent rights. Share-based compensation expense of $27.02 per unit which is based on the award grant date fair value is being recognized over the service period beginning in 2016. On January 26, 2016, certain officers of SJW Corp. were granted performance-based restricted stock units covering an aggregate target number of SJW Corp.'s shares of common stock equal to 12,473 that will vest based on the actual attainment of specified performance goals measured for the 2016 calendar year and continued service through December 31, 2016. The number of shares issuable under the awards, ranging between 0% to 150% of the target number of shares, is based on the level of actual attainment of specified performance goals. The units do not include dividend equivalent rights. The awards have no market conditions and the share-based compensation expense of $29.46 per unit which is based on the award grant date fair value is being recognized assuming the performance goals will be attained. As of September 30, 2016, management believes that the performance goals will be met. On April 27, 2016, restricted stock units covering an aggregate of 7,656 shares of common stock of SJW Corp. were granted to the non-employee board members of SJW Corp. The units vest upon continuous board service through the day immediately preceding the date of the next annual shareholder meeting with no dividend equivalent rights. Share-based compensation expense of $35.79 per unit which is based on the award grant date fair value is being recognized over the service period beginning in 2016. As of September 30, 2016, the total unrecognized compensation costs related to restricted and deferred restricted stock plans was $1,277. This cost is expected to be recognized over a remaining weighted average period of 0.85 years. Employee Stock Purchase Plan The ESPP allows eligible employees to purchase shares of SJW Corp.'s common stock at 85% of the fair value of shares on the purchase date. Under the ESPP, employees can designate up to a maximum of 10% of their base compensation for the purchase of shares of common stock, subject to certain restrictions. A total of 400,000 shares of common stock have been reserved for issuance under the ESPP. After considering estimated employee terminations or withdrawals from the plan before the purchase date, SJW Corp.'s recorded expenses were $51 and $139 for the three and nine months ended September 30, 2016, respectively, and $38 and $120 for the three and nine months ended September 30, 2015, respectively, related to the ESPP. The total unrecognized compensation costs related to the semi-annual offering period that ends January 31, 2017 for the ESPP is approximately $74. This cost is expected to be recognized during the fourth quarter of 2016 and first quarter of 2017.

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- Definition The entire disclosure for accounts comprising shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income, and compensation-related costs for equity-based compensation. Includes, but is not limited to, disclosure of policies, compensation plan details, equity-based arrangements to obtain goods and services, deferred compensation arrangements, and employee stock purchase plan details. + References No definition available. + Details
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