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Contingencies and Gain on Sale of Assets (Details) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jun. 08, 2017 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) customer | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |
Proceeds from sale of assets |  |  | $ 34,324,000 | $ 0 |
Amount spent in clean-up and remediation activities [Abstract] |  |  | 1,500,000 |  |
Utility plant |  | $ 1,155,203,000 | 1,155,203,000 | 1,107,137,000 | $ 1,150,926,000
Accounts receivable |  | 25,338,000 | 25,338,000 |  | 19,993,000
Total Assets |  | 1,462,653,000 | 1,462,653,000 | 1,406,299,000 | 1,470,493,000
Advances for construction |  | (67,209,000) | (67,209,000) |  | (69,722,000)
Contributions in aid of construction - net |  | 123,607,000 | 123,607,000 |  | 120,518,000
GOLDEN STATE WATER COMPANY |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Environmental Remediation Expense |  |  | 5,200,000 |  |
Proceeds from sale of assets |  |  | 34,324,000 | $ 0 |
Utility plant |  | 1,149,475,000 | 1,149,475,000 |  | 1,145,311,000
Accounts receivable |  | 25,338,000 | 25,338,000 |  | 19,993,000
Regulatory assets |  | 145,494,000 | 145,494,000 |  | 146,281,000
Total Assets |  | 1,377,385,000 | 1,377,385,000 |  | 1,384,178,000
Advances for construction |  | (67,209,000) | (67,209,000) |  | (69,722,000)
Contributions in aid of construction - net |  | 123,607,000 | 123,607,000 |  | $ 120,518,000
Environmental Clean-Up and Remediation | GOLDEN STATE WATER COMPANY |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Accrued liability for the estimated additional cost to complete the clean-up at the site |  | 1,400,000 | $ 1,400,000 |  |
City of Claremont | Condemnation of Properties | GOLDEN STATE WATER COMPANY |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss contingency number of customers served | customer |  |  | 11,000 |  |
Ojai Water System |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss contingency number of customers served | 2,900 |  |  |  |
Utility plant | $ 22,256,000 |  |  |  |
Accounts receivable | 721,000 |  |  |  |
Regulatory assets | 3,944,000 |  |  |  |
Total Assets | 26,921,000 |  |  |  |
Advances for construction | (366,000) |  |  |  |
Contributions in aid of construction - net | 532,000 |  |  |  |
Liabilities | (898,000) |  |  |  |
Ojai Water System | GOLDEN STATE WATER COMPANY |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Proceeds from sale of assets | $ 34,300,000 |  |  |  |
Gain (loss) on sale of properties |  | $ 8,300,000 |  |  |

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