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Equity Plans (Tables) | 12 Months Ended
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Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan | 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 are recorded to additional paid-in capital and common stock, by award type, are presented below for the years ended December 31:
| 2016 |  | 2015 |  | 2014
Compensation costs charged to income: |  |  |  |  |
ESPP | $ | 168 |  |  | 158 |  |  | 148 |
Restricted stock and deferred restricted stock | 1,523 |  |  | 1,445 |  |  | 883 |
Total compensation costs charged to income | $ | 1,691 |  |  | 1,603 |  |  | 1,031 |
Proceeds from the exercise of stock options and similar instruments: |  |  |  |  |
Stock options | $ | — |  |  | — |  |  | 1,044 |
ESPP | 954 |  |  | 895 |  |  | 839 |
DRSPP | — |  |  | — |  |  | 34 |
Total proceeds from the exercise of stock options and similar instruments | $ | 954 |  |  | 895 |  |  | 1,917 |
Excess tax benefits realized from share options exercised and stock issuance: |  |  |  |  |
Stock options | $ | — |  |  | — |  |  | 213 |
Restricted stock and deferred restricted stock | 203 |  |  | 634 |  |  | 249 |
Total excess tax benefits realized from share options exercised and stock issuance | $ | 203 |  |  | 634 |  |  | 462 |
Schedule of Share-based Compensation, Stock Options, Activity | As of December 31, 2016 and 2015, there were no outstanding options and no option award activity during the years ended December 31, 2016 and 2015.
Schedule of Share-based Compensation, Restricted Stock Units Award Activity | A summary of SJW Group’s restricted and deferred restricted stock awards as of December 31, 2016, and changes during the year ended December 31, 2016, are presented below:
| Units |  | Weighted- Average Grant- Date Fair Value
Outstanding as of January 1, 2016 | 209,237 |  |  | $ | 21.49 |
Issued | 40,398 |  |  | $ | 29.83 |
Vested | (55,919 | ) |  | $ | 26.92 |
Forfeited or expired | (996 | ) |  | $ | 27.86 |
Outstanding as of December 31, 2016 | 192,720 |  |  | $ | 21.69 |
Shares vested as of December 31, 2016 | 106,817 |  |  | $ | 16.62 |
Schedule of Nonvested Restricted Stock Units Activity | A summary of the status of SJW Group’s nonvested restricted and deferred restricted stock awards as of December 31, 2016, and changes during the year ended December 31, 2016, are presented below:
| Units |  | Weighted- Average Grant- Date Fair Value
Nonvested as of January 1, 2016 | 93,544 |  |  | $ | 27.63 |
Granted | 40,398 |  |  | $ | 29.65 |
Vested | (47,043 | ) |  | $ | 28.71 |
Forfeited | (996 | ) |  | $ | 27.86 |
Nonvested as of December 31, 2016 | 85,903 |  |  | $ | 28.00 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited 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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- 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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