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Unaudited Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating revenue | $ 93,529 | $ 124,578 | $ 102,073 | $ 69,045 | $ 79,306 | $ 112,344 | $ 86,944 | $ 61,112 | $ 389,225 | $ 339,706 | $ 305,082
Operating Income (Loss) | 18,214 | 38,245 | 30,787 | 10,833 | 16,389 | 36,346 | 29,800 | 10,581 | 98,079 | 93,116 | 79,960
Net income | 17,305 | 19,540 | 18,688 | 3,671 | 13,727 | 18,959 | 16,775 | 3,378 | 59,204 | 52,839 | 37,882
Comprehensive income | $ 17,732 | $ 19,620 | $ 18,744 | $ 3,787 | $ 13,834 | $ 18,790 | $ 15,520 | $ 3,908 | $ 59,883 | $ 52,052 | $ 37,676
SJW Group earnings per share |  |  |  |  |  |  |  |  |  |  |
—Basic (in dollars per share) | $ 0.84 | $ 0.95 | $ 0.91 | $ 0.18 | $ 0.67 | $ 0.93 | $ 0.82 | $ 0.17 | $ 2.89 | $ 2.59 | $ 1.86
—Diluted (in dollars per share) | 0.84 | 0.94 | 0.90 | 0.18 | 0.67 | 0.92 | 0.82 | 0.16 | $ 2.86 | $ 2.57 | $ 1.85
Dividends per share | 0.38 | 0.22 | 0.22 | 0.22 | 0.20 | 0.20 | 0.20 | 0.20 |  |  |
--- High (in dollars per share) [Member] |  |  |  |  |  |  |  |  |  |  |
SJW Group earnings per share |  |  |  |  |  |  |  |  |  |  |
Market Price, Stock | 68.13 | 57.43 | 53.00 | 55.30 | 56.69 | 46.66 | 39.38 | 37.50 |  |  |
--- Low (in dollars per share) [Member] |  |  |  |  |  |  |  |  |  |  |
SJW Group earnings per share |  |  |  |  |  |  |  |  |  |  |
Market Price, Stock | $ 57.60 | $ 48.46 | $ 45.74 | $ 46.13 | $ 42.19 | $ 38.13 | $ 32.66 | $ 29.35 |  |  |

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