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Segment and Non-Tariffed Business Reporting (Tables) | 6 Months Ended
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Jun. 30, 2018
Segment Reporting [Abstract] |
Schedule of Segment Reporting Information, by Segment | The following tables set forth information relating to SJW Group’s reportable segments and distribution of regulated and non-tariffed business activities within the reportable segments. Certain allocated assets, revenue and expenses have been included in the reportable segment amounts. Other business activity of SJW Group not included in the reportable segments is included in the “All Other” category.
| For Three Months Ended June 30, 2018
| Water Utility Services |  | Real Estate Services |  | All Other* |  | SJW Group
| Regulated |  | Non-tariffed |  | Non-tariffed |  | Non-tariffed |  | Regulated |  | Non-tariffed |  | Total
Operating revenue | $ | 95,798 |  |  | 1,967 |  |  | 1,321 |  |  | — |  |  | 95,798 |  |  | 3,288 |  |  | 99,086 |
Operating expense | 70,642 |  |  | 1,278 |  |  | 891 |  |  | 3,476 |  |  | 70,642 |  |  | 5,645 |  |  | 76,287 |
Operating income (loss) | 25,156 |  |  | 689 |  |  | 430 |  |  | (3,476 | ) |  | 25,156 |  |  | (2,357 | ) |  | 22,799 |
Net income (loss) before noncontrolling interest | 15,022 |  |  | 497 |  |  | 296 |  |  | (2,944 | ) |  | 15,022 |  |  | (2,151 | ) |  | 12,871 |
Depreciation and amortization | 13,272 |  |  | 85 |  |  | 299 |  |  | — |  |  | 13,272 |  |  | 384 |  |  | 13,656 |
Senior note and other interest expense | 5,540 |  |  | — |  |  | — |  |  | 544 |  |  | 5,540 |  |  | 544 |  |  | 6,084 |
Income tax expense (benefit) in net income | 4,650 |  |  | 193 |  |  | 92 |  |  | (867 | ) |  | 4,650 |  |  | (582 | ) |  | 4,068 |
Assets | $ | 1,449,714 |  |  | 3,768 |  |  | 46,756 |  |  | (117 | ) |  | 1,449,714 |  |  | 50,407 |  |  | 1,500,121 |
| For Three Months Ended June 30, 2017
| Water Utility Services |  | Real Estate Services |  | All Other* |  | SJW Group
| Regulated |  | Non-tariffed |  | Non-tariffed |  | Non-tariffed |  | Regulated |  | Non-tariffed |  | Total
Operating revenue | $ | 98,836 |  |  | 1,910 |  |  | 1,327 |  |  | — |  |  | 98,836 |  |  | 3,237 |  |  | 102,073 |
Operating expense | 67,285 |  |  | 1,223 |  |  | 942 |  |  | 804 |  |  | 67,285 |  |  | 2,969 |  |  | 70,254 |
Operating income (loss) | 31,551 |  |  | 687 |  |  | 385 |  |  | (804 | ) |  | 31,551 |  |  | 268 |  |  | 31,819 |
Net income (loss) before noncontrolling interest | 16,080 |  |  | 320 |  |  | 5,321 |  |  | (1,137 | ) |  | 16,080 |  |  | 4,504 |  |  | 20,584 |
Depreciation and amortization | 11,592 |  |  | 142 |  |  | 299 |  |  | — |  |  | 11,592 |  |  | 441 |  |  | 12,033 |
Senior note, mortgage and other interest expense | 5,215 |  |  | — |  |  | (3 | ) |  | 544 |  |  | 5,215 |  |  | 541 |  |  | 5,756 |
Income tax expense (benefit) in net income | 9,908 |  |  | 236 |  |  | 1,988 |  |  | (168 | ) |  | 9,908 |  |  | 2,056 |  |  | 11,964 |
Assets | $ | 1,398,567 |  |  | 19,358 |  |  | 49,337 |  |  | 3,924 |  |  | 1,398,567 |  |  | 72,619 |  |  | 1,471,186 |
| For Six Months Ended June 30, 2018
| Water Utility Services |  | Real Estate Services |  | All Other* |  | SJW Group
| Regulated |  | Non-tariffed |  | Non-tariffed |  | Non-tariffed |  | Regulated |  | Non-tariffed |  | Total
Operating revenue | $ | 168,151 |  |  | 3,315 |  |  | 2,662 |  |  | — |  |  | 168,151 |  |  | 5,977 |  |  | 174,128 |
Operating expense | 132,343 |  |  | 2,166 |  |  | 1,740 |  |  | 7,749 |  |  | 132,343 |  |  | 11,655 |  |  | 143,998 |
Operating income (loss) | 35,808 |  |  | 1,149 |  |  | 922 |  |  | (7,749 | ) |  | 35,808 |  |  | (5,678 | ) |  | 30,130 |
Net income (loss) | 19,817 |  |  | 828 |  |  | 652 |  |  | (7,141 | ) |  | 19,817 |  |  | (5,661 | ) |  | 14,156 |
Depreciation and amortization | 26,473 |  |  | 168 |  |  | 598 |  |  | — |  |  | 26,473 |  |  | 766 |  |  | 27,239 |
Senior note and other interest expense | 11,048 |  |  | — |  |  | — |  |  | 1,088 |  |  | 11,048 |  |  | 1,088 |  |  | 12,136 |
Income tax expense (benefit) in net income | 5,142 |  |  | 322 |  |  | 186 |  |  | (2,162 | ) |  | 5,142 |  |  | (1,654 | ) |  | 3,488 |
Assets | $ | 1,449,714 |  |  | 3,768 |  |  | 46,756 |  |  | (117 | ) |  | 1,449,714 |  |  | 50,407 |  |  | 1,500,121 |
| For Six Months Ended June 30, 2017
| Water Utility Services |  | Real Estate Services |  | All Other* |  | SJW Group
| Regulated |  | Non-tariffed |  | Non-tariffed |  | Non-tariffed |  | Regulated |  | Non-tariffed |  | Total
Operating revenue | $ | 165,054 |  |  | 3,174 |  |  | 2,890 |  |  | — |  |  | 165,054 |  |  | 6,064 |  |  | 171,118 |
Operating expense | 122,031 |  |  | 2,054 |  |  | 1,890 |  |  | 1,616 |  |  | 122,031 |  |  | 5,560 |  |  | 127,591 |
Operating income (loss) | 43,023 |  |  | 1,120 |  |  | 1,000 |  |  | (1,616 | ) |  | 43,023 |  |  | 504 |  |  | 43,527 |
Net income (loss) | 20,029 |  |  | 492 |  |  | 5,681 |  |  | (1,947 | ) |  | 20,029 |  |  | 4,226 |  |  | 24,255 |
Depreciation and amortization | 23,252 |  |  | 278 |  |  | 622 |  |  | — |  |  | 23,252 |  |  | 900 |  |  | 24,152 |
Senior note, mortgage and other interest expense | 10,640 |  |  | — |  |  | 62 |  |  | 1,111 |  |  | 10,640 |  |  | 1,173 |  |  | 11,813 |
Income tax expense (benefit) in net income | 11,701 |  |  | 373 |  |  | 2,116 |  |  | (658 | ) |  | 11,701 |  |  | 1,831 |  |  | 13,532 |
Assets | $ | 1,398,567 |  |  | 19,358 |  |  | 49,337 |  |  | 3,924 |  |  | 1,398,567 |  |  | 72,619 |  |  | 1,471,186 |
* The “All Other” category includes the accounts of SJW Group and Hydro Sub, Inc. on a stand-alone basis. For the six months ended June 30, 2018, Hydro Sub, Inc. had no recorded revenue or expenses and as of June 30, 2018, held no assets and had incurred no liabilities. For the six months ended June 30, 2017, the “All Other” category includes the accounts of SJW Group on a stand-alone basis.

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8736-108599 + Details
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