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Contingencies (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 08, 2017 USD ($) connection | Dec. 31, 2017 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2018 USD ($) customer | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Contingencies |  |  |  |  |  |
Net utility plant |  | $ 1,204,992 |  | $ 1,296,310 | $ 1,204,992 | $ 1,150,926
Gain on sale of assets | $ 8,300 |  |  |  |  |
Proceeds from Sale of Other Assets | $ 34,300 |  |  |  |  |
GSWC |  |  |  |  |  |
Contingencies |  |  |  |  |  |
Net utility plant |  | 1,197,940 |  | 1,281,092 | 1,197,940 |
Gain on sale of assets |  |  | $ 8,300 |  |  |
Environmental Clean-Up and Remediation | GSWC |  |  |  |  |  |
Contingencies |  |  |  |  |  |
Amount spent in clean-up and remediation activities |  |  |  | 5,900 |  |
Amount paid by the State of California Underground Storage Tank Fund for clean-up and remediation of plant facilities |  |  |  | 1,500 |  |
Accrued liability for the estimated additional cost to complete the clean-up at the site |  |  |  | $ 1,300 |  |
City of Claremont [Member] |  |  |  |  |  |
Contingencies |  |  |  |  |  |
Litigation Settlement, Expense |  | 2,000 |  |  |  |
Legal Fees |  | 1,800 |  |  |  |
Litigation Settlement Interest |  | $ 200 |  |  |  |
City of Claremont [Member] | GSWC |  |  |  |  |  |
Contingencies |  |  |  |  |  |
Litigation Settlement, Expense |  |  |  |  | $ 5,900 |
Number of customers served through water systems | customer |  |  |  | 11,000 |  |
Maximum | City of Claremont [Member] |  |  |  |  |  |
Contingencies |  |  |  |  |  |
Litigation Settlement, Expense |  |  |  |  |  | $ 7,600
Ojai Water System [Member] |  |  |  |  |  |
Contingencies |  |  |  |  |  |
Number of customers served through water systems | connection | 2,900 |  |  |  |  |

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