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Equity Plans (Tables)

12 Months Ended

Dec. 31, 2017

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:

	2017				2016			2015
Compensation costs charged to income:
ESPP	$	214			168			158
Restricted stock and deferred restricted stock	2,429				1,523			1,445
Total compensation costs charged to income	$	2,643			1,691			1,603
Proceeds from the exercise of stock options and similar instruments:
ESPP	1,215				954			895
Total proceeds from the exercise of stock options and similar instruments	$	1,215			954			895
Excess tax benefits realized from share options exercised and stock issuance:
Restricted stock and deferred restricted stock	—				203			634
Total excess tax benefits realized from share options exercised and stock issuance	$	—			203			634

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, 2017, and changes during the year ended December 31, 2017, are presented below:

	Units			Weighted- Average Grant- Date Fair Value
Outstanding as of January 1, 2017	192,720			$	21.69
Issued	48,754			$	52.19
Vested	(50,978	)		$	27.99
Forfeited or expired	—			$	—
Outstanding as of December 31, 2017	190,496			$	27.81
Shares vested as of December 31, 2017	103,013			$	16.71

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, 2017, and changes during the year ended December 31, 2017, are presented below:

	Units			Weighted-  Average Grant- Date Fair Value
Nonvested as of January 1, 2017	85,903			$	28.00
Granted	48,754			$	52.19
Vested	(47,174	)		$	29.10
Forfeited	—			$	—
Nonvested as of December 31, 2017	87,483			$	40.89

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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=96867065&loc=d3e5070-113901

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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=96867065&loc=d3e5070-113901

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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=96867065&loc=d3e5070-113901

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