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Regulatory Matters: Alternative-Revenue Programs (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jul. 01, 2019 | May 30, 2019 | Dec. 31, 2018
Water Revenue Adjustment Mechanism and Modified Cost Balancing Account |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |
Increase (decrease) in other regulatory assets |  |  | $ 16,400 |  |  |  |
GOLDEN STATE WATER COMPANY |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |
Regulatory assets | $ (13,284) |  | $ (13,284) |  |  |  | $ (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 | 832 | $ 5,600 | $ 3,600 | $ 9,800 |  |  |
Regulatory assets | 30,522 |  | $ 30,522 |  |  |  | $ 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 | WRAM |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  | $ 20,400 |
GOLDEN STATE WATER COMPANY | Modified Cost Balancing Account |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |
Regulatory assets | $ 10,800 |  | $ 10,800 |  |  |  |
Subsequent Event [Member] | Water Service Utility Operations [Member] | Revenue Subject to Refund for TCJA [Member] |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |
Regulatory assets |  |  |  |  | $ (7,200) |  |

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