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Regulatory Matters: Alternative-Revenue Programs (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Apr. 08, 2019 | Dec. 31, 2018
Water Revenue Adjustment Mechanism and Modified Cost Balancing Account |  |  |  |
Regulatory matters: |  |  |  |
Increase (decrease) in other regulatory assets | $ 10,000 |  |  |
GOLDEN STATE WATER COMPANY |  |  |  |
Regulatory matters: |  |  |  |
Under (over) collection | $ (23,726) |  |  | $ (28,340)
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 | $ 2,800 | $ 4,200 |  |
Under (over) collection | $ 24,998 |  |  | $ 17,763
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 | Modified Cost Balancing Account |  |  |  |
Regulatory matters: |  |  |  |
Under (over) collection | $ 14,900 |  |  |
Subsequent Event [Member] | GOLDEN STATE WATER COMPANY | WRAM |  |  |  |
Regulatory matters: |  |  |  |
Under (over) collection |  |  | $ 20,400 |

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