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Regulatory Matters: Alternative-Revenue Programs (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2019 | Mar. 31, 2020 | Dec. 31, 2019
Water Revenue Adjustment Mechanism and Modified Cost Balancing Account |  |  |  |  |
Regulatory matters: |  |  |  |  |
Increase (decrease) in other regulatory assets |  |  | $ 4,700 |  |
GOLDEN STATE WATER COMPANY |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory assets |  |  |  | $ 1,867 | $ (2,450)
GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism and Modified Cost Balancing Account |  |  |  |  |
Regulatory matters: |  |  |  |  |
Commercial paper, term |  |  | 90 days |  |
Amount billed to customers as surcharges | $ 2,200 | $ 2,800 |  |  |
Regulatory assets |  |  |  | 25,011 | $ 22,535
GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism and Modified Cost Balancing Account | Minimum |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory Asset Recovery Periods |  |  | 12 months |  |
GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism and Modified Cost Balancing Account | Maximum |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory Asset Recovery Periods |  |  | 24 months |  |
GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism [Member] |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory assets |  |  |  | 11,200 |
GOLDEN STATE WATER COMPANY | Modified Cost Balancing Account |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory assets |  |  |  | $ 13,800 |

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