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Unaudited Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information | Summarized quarterly financial data is as follows:
| 2018 Quarter Ended
| March |  | June |  | September |  | December
Operating revenue | $ | 75,042 |  |  | 99,086 |  |  | 124,853 |  |  | 98,718 |
Operating income | 7,331 |  |  | 22,799 |  |  | 25,828 |  |  | 17,482 |
SJW Group net income | 1,285 |  |  | 12,871 |  |  | 15,788 |  |  | 8,823 |
Comprehensive income | 1,285 |  |  | 12,871 |  |  | 15,788 |  |  | 8,823 |
Earnings per share: |  |  |  |  |  |  |
—Basic | 0.06 |  |  | 0.63 |  |  | 0.77 |  |  | 0.38 |
—Diluted | 0.06 |  |  | 0.62 |  |  | 0.76 |  |  | 0.38 |
Market price range of stock: |  |  |  |  |  |  |
—High | 63.47 |  |  | 68.15 |  |  | 67.29 |  |  | 65.31 |
—Low | 51.96 |  |  | 51.68 |  |  | 56.12 |  |  | 52.63 |
Dividend per share | 0.28 |  |  | 0.28 |  |  | 0.28 |  |  | 0.28 |

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109225645&loc=d3e1280-108306 + Details
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