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Regulatory Matters: (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Regulatory matters: |  |  |  |  |
Regulatory asset not accruing carrying costs | $ 55,700 |  | $ 55,700 |  |
Other Liabilities, Current | 12,434 |  | $ 12,434 |  | $ 11,297
Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory Asset Recovery Periods |  |  | 24 months |  |
Pension and other post-retirement obligations |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory asset not accruing carrying costs | 26,100 |  | $ 26,100 |  |
Derivative unrealized loss |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory asset not accruing carrying costs | 3,837 |  | 3,837 |  |
GOLDEN STATE WATER COMPANY |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory assets | 130,906 |  | 130,906 |  | 146,281
Other Liabilities, Current | 12,088 |  | 12,088 |  | 10,925
GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory Asset Amount Billed to Customers as Surcharges | 11,400 | $ 6,500 | 24,800 | $ 12,900 |
Regulatory assets | 40,230 |  | 40,230 |  | 47,340
GOLDEN STATE WATER COMPANY | Costs deferred for future recovery on Aerojet case |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory assets | 10,983 |  | 10,983 |  | 11,820
GOLDEN STATE WATER COMPANY | Pension and other post-retirement obligations |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory assets | 24,944 |  | 24,944 |  | 28,118
GOLDEN STATE WATER COMPANY | Derivative unrealized loss |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory assets |  |  |  |  | 4,901
GOLDEN STATE WATER COMPANY | Flow-through taxes, net |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory assets | 21,231 |  | 21,231 |  | 20,134
GOLDEN STATE WATER COMPANY | Low income rate assistance balancing accounts |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory assets | 6,779 |  | 6,779 |  | 8,272
GOLDEN STATE WATER COMPANY | General Rate Case Memorandum Accounts [Member] |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory assets | 12,369 |  | 12,369 |  | 13,929
GOLDEN STATE WATER COMPANY | Other regulatory assets |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory assets | 15,322 |  | 15,322 |  | 17,633
GOLDEN STATE WATER COMPANY | Various refunds to customers |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory assets | (4,789) |  | (4,789) |  | $ (5,866)
Water Service Utility Operations | General Rate Case Memorandum Accounts [Member] |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory assets | $ 9,900 |  | $ 9,900 |  |
Maximum | GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory Asset Recovery Periods |  |  | 24 months |  |
Maximum | GOLDEN STATE WATER COMPANY | General Rate Case Memorandum Accounts [Member] |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory Asset Recovery Periods |  |  | 36 months |  |
Minimum | GOLDEN STATE WATER COMPANY | General Rate Case Memorandum Accounts [Member] |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory Asset Recovery Periods |  |  | 12 months |  |

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