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Contingencies (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018
Loss Contingencies [Line Items] |  |  |
Amount spent in clean-up and remediation activities [Abstract] | $ 1,500 |  |
Utility plant | 1,325,502 | $ 1,296,310 | $ 1,218,830
Accounts receivable | 17,485 | 23,395 |
Total Assets | 1,526,097 | 1,501,433 | $ 1,423,664
Advances for construction | (66,185) | (66,305) |
Contributions in aid of construction - net | 125,530 | 124,385 |
GOLDEN STATE WATER COMPANY |  |  |
Loss Contingencies [Line Items] |  |  |
Utility plant | 1,309,664 | 1,281,092 |
Accounts receivable | 17,485 | 23,395 |
Regulatory assets | (23,726) | (28,340) |
Total Assets | 1,410,681 | 1,389,222 |
Advances for construction | (66,185) | (66,305) |
Contributions in aid of construction - net | 125,530 | $ 124,385 |
Environmental Clean-Up and Remediation | GOLDEN STATE WATER COMPANY |  |  |
Loss Contingencies [Line Items] |  |  |
Environmental Remediation Expense | 6,200 |  |
Accrued liability for the estimated additional cost to complete the clean-up at the site | $ 1,300 |  |

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