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Contingencies and Gain on Sale of Assets (Details) |  | 6 Months Ended |
--- | --- | --- | ---
Jun. 08, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items] |  |  |  |
Proceeds from sale of assets |  | $ 29,000 | $ 34,324,000 |
Amount spent in clean-up and remediation activities [Abstract] |  | 1,500,000 |  |
Utility plant |  | 1,238,789,000 | 1,155,203,000 | $ 1,204,992,000
Accounts receivable |  | 26,631,000 |  | 26,127,000
Total Assets |  | 1,441,122,000 | 1,462,653,000 | 1,416,734,000
Advances for construction |  | (66,761,000) |  | (67,465,000)
Contributions in aid of construction - net |  | 123,950,000 |  | 123,602,000
GOLDEN STATE WATER COMPANY |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Environmental Remediation Expense |  | 5,500,000 |  |
Proceeds from sale of assets |  | 0 | 34,324,000 |
Utility plant |  | 1,227,371,000 |  | 1,197,940,000
Accounts receivable |  | 26,631,000 |  | 26,127,000
Regulatory assets |  | (10,799,000) |  | 2,042,000
Total Assets |  | 1,341,075,000 |  | 1,326,823,000
Advances for construction |  | (66,761,000) |  | (67,465,000)
Contributions in aid of construction - net |  | 123,950,000 |  | $ 123,602,000
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 |  | $ 1,300,000 |  |
Ojai Water System |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss contingency number of customers served | 2,900 |  |  |
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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- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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