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Segment and Nonregulated Business Reporting (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 reportable_segment subsidiaries | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Subsidiaries |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |
Operating revenue | $ 67,262 |  | $ 85,238 | $ 74,230 | $ 50,139 | $ 62,449 |  | $ 82,374 | $ 65,575 | $ 51,149 | $ 276,869 |  | $ 261,547 |  | $ 238,955 |
Utilities Operating Expense |  |  |  |  |  |  |  |  |  |  | 223,462 |  | 206,250 |  | 184,564 |
Operating Income (Loss) | 11,351 |  | 19,346 | 16,937 | 5,773 | 14,110 |  | 20,877 | 13,585 | 6,725 | 53,407 |  | 55,297 |  | 54,391 |
Net income | 4,677 |  | 8,950 | 7,440 | 1,317 | 5,924 |  | 10,084 | 5,201 | 1,109 | 22,384 |  | 22,318 |  | 20,878 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 35,039 |  | 33,098 |  | 31,193 |
Provision for income taxes |  |  |  |  |  |  |  |  |  |  | 14,135 |  | 15,542 |  | 14,566 |
Assets | 1,109,986 |  |  |  |  | 1,087,499 |  |  |  |  | 1,109,986 |  | 1,087,499 |  |  |
Number of Reportable Segments |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |
SJW Corp. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  |  | 276,869 |  | 261,547 |  | 238,955 |
Utilities Operating Expense |  |  |  |  |  |  |  |  |  |  | 223,462 |  | 206,250 |  | 184,564 |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  | 53,407 |  | 55,297 |  | 54,391 |
Net income |  |  |  |  |  |  |  |  |  |  | 22,384 |  | 22,318 |  | 20,878 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 35,039 |  | 33,098 |  | 31,193 |
Interest Expense |  |  |  |  |  |  |  |  |  |  | 19,922 |  | 20,185 |  | 19,675 |
Provision for income taxes |  |  |  |  |  |  |  |  |  |  | 14,135 |  | 15,542 |  | 14,566 |
Assets | 1,109,986 |  |  |  |  | 1,087,499 |  |  |  |  | 1,109,986 |  | 1,087,499 |  | 1,038,810 |
Regulated [Member] | Water Utility Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  |  | 264,782 |  | 251,032 |  | 229,411 |
Utilities Operating Expense |  |  |  |  |  |  |  |  |  |  | 212,761 |  | 197,893 |  | 175,812 |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  | 52,021 |  | 53,139 |  | 53,599 |
Net income |  |  |  |  |  |  |  |  |  |  | 23,273 |  | 22,811 |  | 21,970 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 33,067 |  | 31,085 |  | 29,136 |
Interest Expense |  |  |  |  |  |  |  |  |  |  | 16,616 |  | 16,499 |  | 16,741 |
Provision for income taxes |  |  |  |  |  |  |  |  |  |  | 14,446 |  | 15,678 |  | 15,387 |
Assets | 1,013,229 |  |  |  |  | 991,866 |  |  |  |  | 1,013,229 |  | 991,866 |  | 917,580 |
Regulated [Member] | SJW Corp. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  |  | 264,782 |  | 251,032 |  | 229,411 |
Utilities Operating Expense |  |  |  |  |  |  |  |  |  |  | 212,761 |  | 197,893 |  | 175,812 |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  | 52,021 |  | 53,139 |  | 53,599 |
Net income |  |  |  |  |  |  |  |  |  |  | 23,273 |  | 22,811 |  | 21,970 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 33,067 |  | 31,085 |  | 29,136 |
Interest Expense |  |  |  |  |  |  |  |  |  |  | 16,616 |  | 16,499 |  | 16,741 |
Provision for income taxes |  |  |  |  |  |  |  |  |  |  | 14,446 |  | 15,678 |  | 15,387 |
Assets | 1,013,229 |  |  |  |  | 991,866 |  |  |  |  | 1,013,229 |  | 991,866 |  | 917,580 |
Nonregulated [Member] | Water Utility Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  |  | 5,882 |  | 5,523 |  | 4,935 |
Utilities Operating Expense |  |  |  |  |  |  |  |  |  |  | 5,683 |  | 4,043 |  | 3,481 |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  | 199 |  | 1,480 |  | 1,454 |
Net income |  |  |  |  |  |  |  |  |  |  | (208) |  | 707 |  | 765 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 360 |  | 360 |  | 360 |
Interest Expense |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Provision for income taxes |  |  |  |  |  |  |  |  |  |  | 124 |  | 581 |  | 571 |
Assets | 16,163 |  |  |  |  | 13,245 |  |  |  |  | 16,163 |  | 13,245 |  | 11,668 |
Nonregulated [Member] | Real Estate Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  |  | 6,205 |  | 4,992 |  | 4,609 |
Utilities Operating Expense |  |  |  |  |  |  |  |  |  |  | 4,000 |  | 3,379 |  | 3,240 |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  | 2,205 |  | 1,613 |  | 1,369 |
Net income |  |  |  |  |  |  |  |  |  |  | 920 |  | 244 |  | (407) |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 1,612 |  | 1,653 |  | 1,697 |
Interest Expense |  |  |  |  |  |  |  |  |  |  | 1,120 |  | 1,511 |  | 1,833 |
Provision for income taxes |  |  |  |  |  |  |  |  |  |  | 768 |  | 374 |  | (296) |
Assets | 71,779 |  |  |  |  | 74,903 |  |  |  |  | 71,779 |  | 74,903 |  | 80,097 |
Nonregulated [Member] | All Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  |  | 0 | [1] | 0 | [1] | 0 | [1]
Utilities Operating Expense |  |  |  |  |  |  |  |  |  |  | 1,018 | [1] | 935 | [1] | 2,031 | [1]
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  | (1,018) | [1] | (935) | [1] | (2,031) | [1]
Net income |  |  |  |  |  |  |  |  |  |  | (1,601) | [1] | (1,444) | [1] | (1,450) | [1]
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 0 | [1] | 0 | [1] | 0 | [1]
Interest Expense |  |  |  |  |  |  |  |  |  |  | 2,186 | [1] | 2,175 | [1] | 1,101 | [1]
Provision for income taxes |  |  |  |  |  |  |  |  |  |  | (1,203) | [1] | (1,091) | [1] | (1,096) | [1]
Assets | 8,815 | [1] |  |  |  | 7,485 | [1] |  |  |  | 8,815 | [1] | 7,485 | [1] | 29,465 | [1]
Nonregulated [Member] | SJW Corp. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  |  | 12,087 |  | 10,515 |  | 9,544 |
Utilities Operating Expense |  |  |  |  |  |  |  |  |  |  | 10,701 |  | 8,357 |  | 8,752 |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  | 1,386 |  | 2,158 |  | 792 |
Net income |  |  |  |  |  |  |  |  |  |  | (889) |  | (493) |  | (1,092) |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 1,972 |  | 2,013 |  | 2,057 |
Interest Expense |  |  |  |  |  |  |  |  |  |  | 3,306 |  | 3,686 |  | 2,934 |
Provision for income taxes |  |  |  |  |  |  |  |  |  |  | (311) |  | (136) |  | (821) |
Assets | $ 96,757 |  |  |  |  | $ 95,633 |  |  |  |  | $ 96,757 |  | $ 95,633 |  | $ 121,230 |
[1] | The “All Other” category includes the accounts of SJW Corp. on a stand-alone basis.

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