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Regulatory Matters: (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
Regulatory matters: |  |  |  |  |  |  |
Regulatory asset not accruing carrying costs | $ (55,700) |  | $ (55,700) |  |  |  |
Pension and other post-retirement obligations |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |
Regulatory asset not accruing carrying costs | (35,300) |  | (35,300) |  |  |  |
GOLDEN STATE WATER COMPANY |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |
Regulatory assets | 13,284 |  | 13,284 |  |  |  | $ 28,340
GOLDEN STATE WATER COMPANY | Tax Cuts and Jobs Act memorandum accounts |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |
Regulatory assets | 8,987 |  | 8,987 |  |  |  | 8,293
GOLDEN STATE WATER COMPANY | Various refunds to customers |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |
Regulatory assets | 9,358 |  | 9,358 |  |  |  | 7,517
GOLDEN STATE WATER COMPANY | Authorized Capital Infrastructure [Member] |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  | $ (334,500) |
GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism and Modified Cost Balancing Account |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |
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 | Costs deferred for future recovery on Aerojet case |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |
Regulatory assets | (9,166) |  | (9,166) |  |  |  | (9,516)
GOLDEN STATE WATER COMPANY | Pension and other post-retirement obligations |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |
Regulatory assets | (32,444) |  | (32,444) |  |  |  | (33,124)
GOLDEN STATE WATER COMPANY | Derivative [Member] |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |
Regulatory asset not accruing carrying costs | (267) |  | (267) |  |  |  |
GOLDEN STATE WATER COMPANY | Derivative unrealized loss |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |
Regulatory assets | (267) |  | (267) |  |  |  | (311)
GOLDEN STATE WATER COMPANY | Low income rate assistance balancing accounts |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |
Regulatory assets | (1,787) |  | (1,787) |  |  |  | (2,784)
GOLDEN STATE WATER COMPANY | General Rate Case Memorandum Accounts |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |
Regulatory assets | (8,025) |  | (8,025) |  |  |  | (5,054)
GOLDEN STATE WATER COMPANY | Deferred Income Tax Charge |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |
Regulatory asset not accruing carrying costs | (80,700) |  | (80,700) |  |  |  |
Regulatory assets | 80,690 |  | 80,690 |  |  |  | 81,465
GOLDEN STATE WATER COMPANY | Flow-through taxes, net |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |
Regulatory asset not accruing carrying costs | (14,200) |  | (14,200) |  |  |  |
Regulatory assets | 14,160 |  | 14,160 |  |  |  | 15,273
GOLDEN STATE WATER COMPANY | Other Regulatory Assets Net [Member] |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |
Regulatory assets | (17,700) |  | (17,700) |  |  |  | $ (15,656)
GOLDEN STATE WATER COMPANY | Deferred Project Costs [Member] |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  | $ (20,400) |
GOLDEN STATE WATER COMPANY | Other Regulatory Assets (Liabilities) [Member] |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |
Regulatory assets | (1,100) |  | (1,100) |  |  |  |
GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism [Member] |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |
Regulatory assets | (19,700) |  | (19,700) |  |  |  |
Water general rate case [Member] | General Rate Case Memorandum Accounts |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |
Regulatory assets | $ (5,600) |  | $ (5,600) |  |  |  |
Subsequent Event [Member] | Water Service Utility Operations [Member] | Tax Cuts and Jobs Act memorandum accounts |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |
Regulatory assets |  |  |  |  | $ 7,200 |  |
Maximum [Member] | GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism and Modified Cost Balancing Account |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |
Regulatory Asset Recovery Periods |  |  | 24 months |  |  |  |
Maximum [Member] | GOLDEN STATE WATER COMPANY | General Rate Case Memorandum Accounts |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |
Regulatory Asset Recovery Periods |  |  | 24 months |  |  |  |
Minimum [Member] | GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism and Modified Cost Balancing Account |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |
Regulatory Asset Recovery Periods |  |  | 12 months |  |  |  |
Minimum [Member] | GOLDEN STATE WATER COMPANY | General Rate Case Memorandum Accounts |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |
Regulatory Asset Recovery Periods |  |  | 12 months |  |  |  |

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