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Unaudited Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information | Summarized quarterly financial data is as follows:
| 2019 Quarter Ended
| March |  | June |  | September |  | December
Operating revenue | $ | 77,682 |  |  | 102,965 |  |  | 113,997 |  |  | 125,838 |
Operating income | 12,408 |  |  | 21,971 |  |  | 17,084 |  |  | 6,016 |
SJW Group net income | 5,873 |  |  | 13,538 |  |  | 9,478 |  |  | (5,486 | )
Comprehensive income | 5,873 |  |  | 13,538 |  |  | 9,478 |  |  | (5,360 | )
Earnings per share: |  |  |  |  |  |  |
—Basic | 0.21 |  |  | 0.48 |  |  | 0.33 |  |  | (0.20 | )
—Diluted | 0.21 |  |  | 0.47 |  |  | 0.33 |  |  | (0.19 | )
Market price range of stock: |  |  |  |  |  |  |
—High | 63.76 |  |  | 63.40 |  |  | 69.23 |  |  | 74.47 |
—Low | 54.74 |  |  | 59.83 |  |  | 61.23 |  |  | 67.13 |
Dividend per share | 0.30 |  |  | 0.30 |  |  | 0.30 |  |  | 0.30 |

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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=118952077&loc=d3e1280-108306 + Details
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