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Income Taxes: (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Effective income tax rate |  |  |  |  |
Deferred Tax Liabilities Related to Repair-And-Maintenance Deductions |  |  |  |  | $ 30.8
GSWC |  |  |  |  |
Effective income tax rate |  |  |  |  |
ETRs (as a percent) | 40.50% | 42.10% | 40.70% | 40.40% |

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