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Regulatory Matters: (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Regulatory matters: |  |  |  |  |  |
Regulatory asset not accruing carrying costs | $ 59,400 |  |  | $ 59,400 |  |
Other Liabilities, Current | $ 13,262 |  |  | $ 13,262 |  | $ 15,109
Cost of Capital, Proceeding for Water Regions [Member] |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Return on Equity Percentage | 9.40% |  |  | 9.40% |  |
Weighted Cost of Capital Percent | 8.30% |  |  | 8.30% |  |
Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Increase (Decrease) in Other Regulatory Assets |  |  |  | $ 9,900 |  |
Pension and other post-retirement obligations |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Regulatory asset not accruing carrying costs | $ 33,900 |  |  | 33,900 |  |
Derivative unrealized loss |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Regulatory asset not accruing carrying costs | 1,710 |  |  | 1,710 |  |
Revenue Subject to Refund [Member] |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Decrease in revenues requirement to reflect the newly adopted Cost of Capital for GSWC |  |  |  | 952 |  |
GOLDEN STATE WATER COMPANY |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Regulatory assets | (10,799) |  |  | (10,799) |  | 2,042
Other Liabilities, Current | 12,383 |  |  | 12,383 |  | 14,705
GOLDEN STATE WATER COMPANY | Modified Cost Balancing Account [Member] |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Regulatory assets | $ 23,000 |  |  | $ 23,000 |  |
GOLDEN STATE WATER COMPANY | Cost of Capital, Proceeding for Water Regions [Member] |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Return on Equity Percentage | 8.90% |  |  | 8.90% |  |
Weighted Cost of Capital Percent | 7.90% |  |  | 7.90% |  |
GOLDEN STATE WATER COMPANY | Revenue Subject to Refund [Member] |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Adjustments recorded to revalue deferred taxes as a result of the tax cut and job act of 2017 impact | $ 3,700 |  |  | $ 6,400 |  |
GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Investment Term |  |  |  | 90 days |  |
Regulatory Asset Amount Billed to Customers as Surcharges | 5,600 |  | $ 9,500 | $ 9,800 | $ 13,400 |
Regulatory assets | 29,604 |  |  | 29,604 |  | 29,556
GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism [Member] |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Regulatory assets | 6,600 |  |  | 6,600 |  |
GOLDEN STATE WATER COMPANY | Costs deferred for future recovery on Aerojet case |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Regulatory assets | 10,272 |  |  | 10,272 |  | 10,656
GOLDEN STATE WATER COMPANY | Pension and other post-retirement obligations |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Regulatory assets | 31,705 |  |  | 31,705 |  | 33,019
GOLDEN STATE WATER COMPANY | Derivative unrealized loss |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Regulatory assets |  |  |  |  |  | 2,941
GOLDEN STATE WATER COMPANY | Flow-through taxes, net |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Regulatory assets | (16,508) |  |  | (16,508) |  | (17,716)
GOLDEN STATE WATER COMPANY | Low income rate assistance balancing accounts |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Regulatory assets | 4,982 |  |  | 4,982 |  | 5,972
GOLDEN STATE WATER COMPANY | General Rate Case Memorandum Accounts [Member] |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Regulatory assets | 8,241 |  |  | 8,241 |  | 10,522
GOLDEN STATE WATER COMPANY | Deferred Income Tax Charge [Member] |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Regulatory assets | 82,128 |  |  | 82,128 |  | (83,231)
GOLDEN STATE WATER COMPANY | Other regulatory assets |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Regulatory assets | 15,677 |  |  | 15,677 |  | 14,875
GOLDEN STATE WATER COMPANY | Revenue Subject to Refund [Member] |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Regulatory assets | (14,354) |  |  | (14,354) |  | $ (4,552)
Decrease in revenues requirement to reflect the newly adopted Cost of Capital for GSWC |  |  |  | 3,600 |  |
Electric Service Utility Operations [Member] | Revenue Subject to Refund [Member] |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Adjustments recorded to revalue deferred taxes as a result of the tax cut and job act of 2017 impact | $ 356 |  |  | $ 723 |  |
Maximum | GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Regulatory Asset Recovery Periods |  | 24 months |  |  |  |
Recovery Period for under Collection, Balances Greater than 15 Percent of Adopted Annual Revenues |  |  |  | 24 years |  |
Minimum [Member] | GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Recovery Period for under Collection, Balances Greater than 15 Percent of Adopted Annual Revenues |  |  |  | 12 months |  |

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