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Segment and Nonregulated Business Reporting (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) subsidiaries | Jun. 30, 2014 USD ($) | Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |
Number of Subsidiaries | subsidiaries |  |  |  | 5 |  |
Operating revenue |  | $ 72,402 | $ 70,356 | $ 134,514 | $ 124,952 |
Operating expense |  | 55,192 | 58,235 | 104,499 | 106,777 |
Operating income (loss) |  | 17,210 | 12,121 | 30,015 | 18,175 |
Net income (loss) |  | 7,461 | 6,846 | 12,156 | 7,752 |
Depreciation and amortization |  | 10,202 | 9,495 | 20,361 | 18,980 |
Senior note, mortgage and other interest expense |  | 5,618 | 4,954 | 11,270 | 9,824 |
Income tax expense (benefit) in net income |  | 4,405 | 3,092 | 7,199 | 3,653 |
Assets |  | 1,295,857 | 1,147,022 | 1,295,857 | 1,147,022 | $ 1,269,304
Water Utility Services | Regulated |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenue |  | 69,011 | 66,967 | 127,898 | 118,593 |
Operating expense |  | 52,555 | 55,642 | 99,477 | 102,105 |
Operating income (loss) |  | 16,456 | 11,325 | 28,421 | 16,488 |
Net income (loss) |  | 7,556 | 5,591 | 12,257 | 6,494 |
Depreciation and amortization |  | 9,693 | 8,989 | 19,372 | 17,966 |
Senior note, mortgage and other interest expense |  | 4,814 | 4,139 | 9,644 | 8,220 |
Income tax expense (benefit) in net income |  | 4,457 | 2,208 | 7,275 | 2,760 |
Assets |  | 1,205,819 | 1,053,145 | 1,205,819 | 1,053,145 |
Water Utility Services | Non-tariffed |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenue |  | 1,588 | 1,553 | 3,035 | 2,781 |
Operating expense |  | 1,343 | 1,216 | 2,305 | 2,088 |
Operating income (loss) |  | 245 | 337 | 730 | 693 |
Net income (loss) |  | 55 | 132 | 273 | 283 |
Depreciation and amortization |  | 121 | 90 | 211 | 180 |
Senior note, mortgage and other interest expense |  | 0 | 0 | 0 | 0 |
Income tax expense (benefit) in net income |  | 93 | 117 | 275 | 241 |
Assets |  | 18,611 | 17,487 | 18,611 | 17,487 |
Real Estate Services | Non-tariffed |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenue |  | 1,803 | 1,836 | 3,581 | 3,578 |
Operating expense |  | 1,003 | 1,055 | 2,027 | 2,077 |
Operating income (loss) |  | 800 | 781 | 1,554 | 1,501 |
Net income (loss) |  | 272 | 380 | 532 | 584 |
Depreciation and amortization |  | 388 | 416 | 778 | 834 |
Senior note, mortgage and other interest expense |  | 255 | 262 | 510 | 499 |
Income tax expense (benefit) in net income |  | 163 | 273 | 308 | 426 |
Assets |  | 67,066 | 66,300 | 67,066 | 66,300 |
All Other | Non-tariffed |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenue | [1] | 0 | 0 | 0 | 0 |
Operating expense | [1] | 291 | 322 | 690 | 507 |
Operating income (loss) | [1] | (291) | (322) | (690) | (507) |
Net income (loss) | [1] | (422) | 743 | (906) | 391 |
Depreciation and amortization | [1] | 0 | 0 | 0 | 0 |
Senior note, mortgage and other interest expense | [1] | 549 | 553 | 1,116 | 1,105 |
Income tax expense (benefit) in net income | [1] | (308) | 494 | (659) | 226 |
Assets | [1] | 4,361 | 10,090 | 4,361 | 10,090 |
SJW Corp. | Regulated |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenue |  | 69,011 | 66,967 | 127,898 | 118,593 |
Operating expense |  | 52,555 | 55,642 | 99,477 | 102,105 |
Operating income (loss) |  | 16,456 | 11,325 | 28,421 | 16,488 |
Net income (loss) |  | 7,556 | 5,591 | 12,257 | 6,494 |
Depreciation and amortization |  | 9,693 | 8,989 | 19,372 | 17,966 |
Senior note, mortgage and other interest expense |  | 4,814 | 4,139 | 9,644 | 8,220 |
Income tax expense (benefit) in net income |  | 4,457 | 2,208 | 7,275 | 2,760 |
Assets |  | 1,205,819 | 1,053,145 | 1,205,819 | 1,053,145 |
SJW Corp. | Non-tariffed |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenue |  | 3,391 | 3,389 | 6,616 | 6,359 |
Operating expense |  | 2,637 | 2,593 | 5,022 | 4,672 |
Operating income (loss) |  | 754 | 796 | 1,594 | 1,687 |
Net income (loss) |  | (95) | 1,255 | (101) | 1,258 |
Depreciation and amortization |  | 509 | 506 | 989 | 1,014 |
Senior note, mortgage and other interest expense |  | 804 | 815 | 1,626 | 1,604 |
Income tax expense (benefit) in net income |  | (52) | 884 | (76) | 893 |
Assets |  | $ 90,038 | $ 93,877 | $ 90,038 | $ 93,877 |
[1] | * The “All Other” category includes the accounts of SJW Corp. on a stand-alone basis and SJW Group, Inc. For the three and six months ended June 30, 2015, SJW Group, Inc. had no revenue or expenses recorded and held no assets as of June 30, 2015.

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