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Unaudited Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information | Summarized quarterly financial data is as follows:
| 2020 Quarter Ended
| March |  | June |  | September |  | December
Operating revenue | $ | 115,754 |  |  | 147,209 |  |  | 165,863 |  |  | 135,700 |
Operating income | 15,427 |  |  | 36,070 |  |  | 41,883 |  |  | 24,290 |
SJW Group net income | 2,417 |  |  | 19,721 |  |  | 26,093 |  |  | 13,284 |
Comprehensive income | 2,282 |  |  | 19,731 |  |  | 26,169 |  |  | 12,142 |
Earnings per share: |  |  |  |  |  |  |
—Basic | 0.08 |  |  | 0.69 |  |  | 0.91 |  |  | 0.47 |
—Diluted | 0.08 |  |  | 0.69 |  |  | 0.91 |  |  | 0.46 |
Market price range of stock: |  |  |  |  |  |  |
—High | 74.73 |  |  | 65.93 |  |  | 71.06 |  |  | 70.34 |
—Low | 49.48 |  |  | 53.11 |  |  | 58.56 |  |  | 60.11 |
Dividend per share | 0.32 |  |  | 0.32 |  |  | 0.32 |  |  | 0.32 |
| 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=121640914&loc=d3e1280-108306 + Details
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