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Unaudited Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information | Summarized quarterly financial data is as follows:
| 2017 Quarter Ended
| March |  | June |  | September |  | December
Operating revenue | $ | 69,045 |  |  | 102,073 |  |  | 124,578 |  |  | 93,529 |
Operating income | 10,833 |  |  | 30,787 |  |  | 38,245 |  |  | 18,214 |
SJW Group net income | 3,671 |  |  | 18,688 |  |  | 19,540 |  |  | 17,305 |
Comprehensive income | 3,787 |  |  | 18,744 |  |  | 19,620 |  |  | 17,732 |
Earnings per share: |  |  |  |  |  |  |
—Basic | 0.18 |  |  | 0.91 |  |  | 0.95 |  |  | 0.84 |
—Diluted | 0.18 |  |  | 0.90 |  |  | 0.94 |  |  | 0.84 |
Market price range of stock: |  |  |  |  |  |  |
—High | 55.30 |  |  | 53.00 |  |  | 57.43 |  |  | 68.13 |
—Low | 46.13 |  |  | 45.74 |  |  | 48.46 |  |  | 57.60 |
Dividend per share | 0.22 |  |  | 0.22 |  |  | 0.22 |  |  | 0.38 |

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=84173487&loc=d3e1280-108306 + Details
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