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Contingencies and Gain on Sale of Assets (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017
Loss Contingencies [Line Items] |  |  |
Amount spent in clean-up and remediation activities [Abstract] | $ 1,500 |  |
Utility plant | 1,218,830 | $ 1,204,992 | $ 1,137,159
Accounts receivable | 19,224 | 26,127 |
Total Assets | 1,423,664 | 1,416,734 | $ 1,480,268
Advances for construction | (67,364) | (67,465) |
Contributions in aid of construction - net | 123,715 | 123,602 |
GOLDEN STATE WATER COMPANY |  |  |
Loss Contingencies [Line Items] |  |  |
Utility plant | 1,209,299 | 1,197,940 |
Accounts receivable | 19,224 | 26,127 |
Regulatory assets | (4,728) | 2,042 |
Total Assets | 1,324,556 | 1,326,823 |
Advances for construction | (67,364) | (67,465) |
Contributions in aid of construction - net | 123,715 | $ 123,602 |
Environmental Clean-Up and Remediation | GOLDEN STATE WATER COMPANY |  |  |
Loss Contingencies [Line Items] |  |  |
Environmental Remediation Expense | 5,500 |  |
Accrued liability for the estimated additional cost to complete the clean-up at the site | $ 1,300 |  |

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