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Segment and Non-Tariffed Business Reporting (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) subsidiary reportable_segment | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of subsidiaries | subsidiary |  | 4 |  |
Number of reportable business segments | reportable_segment |  | 2 |  |
Operating revenue |  | $ 75,042 | $ 69,045 |
Operating expense |  | 67,711 | 57,341 |
Operating income (loss) |  | 7,331 | 11,704 |
Net income (loss) before noncontrolling interest |  | 1,285 | 3,671 |
Depreciation and amortization |  | 13,583 | 12,119 |
Senior note, mortgage and other interest expense |  | 6,052 | 6,057 |
Income tax expense (benefit) in net income |  | (580) | 1,568 |
Assets |  | 1,463,874 | 1,435,777 | $ 1,458,001
Water Utility Services | Regulated |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenue |  | 72,353 | 66,218 |
Operating expense |  | 61,701 | 54,750 |
Operating income (loss) |  | 10,652 | 11,468 |
Net income (loss) before noncontrolling interest |  | 4,795 | 3,949 |
Depreciation and amortization |  | 13,201 | 11,660 |
Senior note, mortgage and other interest expense |  | 5,508 | 5,425 |
Income tax expense (benefit) in net income |  | 492 | 1,793 |
Assets |  | 1,413,300 | 1,360,599 |
Water Utility Services | Non-tariffed |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenue |  | 1,348 | 1,264 |
Operating expense |  | 888 | 831 |
Operating income (loss) |  | 460 | 433 |
Net income (loss) before noncontrolling interest |  | 331 | 172 |
Depreciation and amortization |  | 83 | 136 |
Senior note, mortgage and other interest expense |  | 0 | 0 |
Income tax expense (benefit) in net income |  | 129 | 137 |
Assets |  | 3,690 | 18,247 |
Real Estate Services | Non-tariffed |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenue |  | 1,341 | 1,563 |
Operating expense |  | 849 | 948 |
Operating income (loss) |  | 492 | 615 |
Net income (loss) before noncontrolling interest |  | 356 | 360 |
Depreciation and amortization |  | 299 | 323 |
Senior note, mortgage and other interest expense |  | 0 | 65 |
Income tax expense (benefit) in net income |  | 94 | 128 |
Assets |  | 47,380 | 54,269 |
All Other | Non-tariffed |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenue | [1] | 0 | 0 |
Operating expense | [1] | 4,273 | 812 |
Operating income (loss) | [1] | (4,273) | (812) |
Net income (loss) before noncontrolling interest | [1] | (4,197) | (810) |
Depreciation and amortization | [1] | 0 | 0 |
Senior note, mortgage and other interest expense | [1] | 544 | 567 |
Income tax expense (benefit) in net income | [1] | (1,295) | (490) |
Assets | [1] | (496) | 2,662 |
SJW Group | Regulated |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenue |  | 72,353 | 66,218 |
Operating expense |  | 61,701 | 54,750 |
Operating income (loss) |  | 10,652 | 11,468 |
Net income (loss) before noncontrolling interest |  | 4,795 | 3,949 |
Depreciation and amortization |  | 13,201 | 11,660 |
Senior note, mortgage and other interest expense |  | 5,508 | 5,425 |
Income tax expense (benefit) in net income |  | 492 | 1,793 |
Assets |  | 1,413,300 | 1,360,599 |
SJW Group | Non-tariffed |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenue |  | 2,689 | 2,827 |
Operating expense |  | 6,010 | 2,591 |
Operating income (loss) |  | (3,321) | 236 |
Net income (loss) before noncontrolling interest |  | (3,510) | (278) |
Depreciation and amortization |  | 382 | 459 |
Senior note, mortgage and other interest expense |  | 544 | 632 |
Income tax expense (benefit) in net income |  | (1,072) | (225) |
Assets |  | $ 50,574 | $ 75,178 |
[1] | * The “All Other” category includes the accounts of SJW Group and Hydro Sub, Inc. on a stand-alone basis

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