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Fair Value of Financial Instruments: (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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GOLDEN STATE WATER COMPANY | Reported Value Measurement |  |
Fair value of financial instruments |  |
Long-term Debt, Fair Value | $ 284,892 | $ 324,978
GOLDEN STATE WATER COMPANY | Estimate of Fair Value Measurement |  |
Fair value of financial instruments |  |
Long-term Debt, Fair Value | 363,757 | $ 387,889
Mutual Funds | Fair Value, Inputs, Level 1 |  |
Financial liabilities: |  |
Long-term debt-GSWC | 17,800 |
Notes Payable 6.7 Percent Due 2019 [Member] | GOLDEN STATE WATER COMPANY |  |
Fair value of financial instruments |  |
Debt and Capital Lease Obligations | $ 40,000 |
Financial liabilities: |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.70% |

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