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Segment and Non-Tariffed Businesses Reporting (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) subsidiary reportable_segment | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Segment Reporting Information [Line Items] |  |  |
Number of subsidiaries | subsidiary | 4 |  |
Number of reportable segments | reportable_segment | 2 |  |
Operating revenue | $ 573,686 | $ 564,526 | $ 420,482
Operating expense | 462,527 | 446,856 | 363,003
Operating income (loss) | 111,159 | 117,670 | 57,479
Net income (loss) | 60,478 | 61,515 | 23,403
Depreciation and amortization | 94,400 | 89,279 | 65,592
Senior note and other interest expense | 54,339 | 54,255 | 31,796
Provision for income taxes | 8,369 | 8,380 | 8,454
Assets | 3,492,395 | 3,311,465 | 3,132,470
Regulated | Water Utility Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenue | 558,154 | 548,013 | 407,116
Operating expense | 449,401 | 431,375 | 329,520
Operating income (loss) | 108,753 | 116,638 | 77,596
Net income (loss) | 67,530 | 69,245 | 42,691
Depreciation and amortization | 91,896 | 86,758 | 63,775
Senior note and other interest expense | 34,308 | 33,877 | 25,073
Provision for income taxes | 10,327 | 16,563 | 8,382
Assets | 3,380,637 | 3,197,626 | 3,016,846
Regulated | SJW Corp. |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenue | 558,154 | 548,013 | 407,116
Operating expense | 449,401 | 431,375 | 329,520
Operating income (loss) | 108,753 | 116,638 | 77,596
Net income (loss) | 67,530 | 69,245 | 42,691
Depreciation and amortization | 91,896 | 86,758 | 63,775
Senior note and other interest expense | 34,308 | 33,877 | 25,073
Provision for income taxes | 10,327 | 16,563 | 8,382
Assets | 3,380,637 | 3,197,626 | 3,016,846
Non- tariffed | Water Utility Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenue | 10,153 | 10,981 | 7,969
Operating expense | 7,138 | 6,943 | 5,443
Operating income (loss) | 3,015 | 4,038 | 2,526
Net income (loss) | 3,309 | 4,099 | 2,019
Depreciation and amortization | 443 | 442 | 420
Senior note and other interest expense | 0 | 0 | 0
Provision for income taxes | 369 | 998 | 708
Assets | 6,916 | 8,869 | 5,507
Non- tariffed | Real Estate Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenue | 5,379 | 5,532 | 5,397
Operating expense | 3,585 | 3,510 | 3,751
Operating income (loss) | 1,794 | 2,022 | 1,646
Net income (loss) | 1,950 | 1,455 | 1,623
Depreciation and amortization | 1,168 | 1,186 | 1,196
Senior note and other interest expense | 0 | 0 | 0
Provision for income taxes | 619 | 467 | 486
Assets | 43,383 | 44,405 | 46,778
Non- tariffed | All Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenue | 0 | 0 | 0
Operating expense | 2,403 | 5,028 | 24,289
Operating income (loss) | (2,403) | (5,028) | (24,289)
Net income (loss) | (12,311) | (13,284) | (22,930)
Depreciation and amortization | 893 | 893 | 201
Senior note and other interest expense | 20,031 | 20,378 | 6,723
Provision for income taxes | (2,946) | (9,648) | (1,122)
Assets | 61,459 | 60,565 | 63,339
Non- tariffed | SJW Corp. |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenue | 15,532 | 16,513 | 13,366
Operating expense | 13,126 | 15,481 | 33,483
Operating income (loss) | 2,406 | 1,032 | (20,117)
Net income (loss) | (7,052) | (7,730) | (19,288)
Depreciation and amortization | 2,504 | 2,521 | 1,817
Senior note and other interest expense | 20,031 | 20,378 | 6,723
Provision for income taxes | (1,958) | (8,183) | 72
Assets | $ 111,758 | $ 113,839 | $ 115,624

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