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Income Taxes: (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
GOLDEN STATE WATER COMPANY |  |  |  |
Effective income tax rate |  |  |  |
ETRs (as a percent) | 39.80% | 39.00% | 38.80% | 38.50%
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense | $ 327 |  | $ 701 |
Consolidated Entities [Member] |  |  |  |
Effective income tax rate |  |  |  |
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense | $ 328 |  | $ 740 |
Parent [Member] |  |  |  |
Effective income tax rate |  |  |  |
ETRs (as a percent) | 38.60% | 37.50% | 37.40% | 37.10%

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