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Income Taxes: (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Effective income tax rate |  |
Other Income Tax Expense (Benefit), Continuing Operations | $ 412,000 |
GSWC |  |
Effective income tax rate |  |
ETRs (as a percent) | 36.90% | 37.70%
Other Income Tax Expense (Benefit), Continuing Operations | $ 374,000 |

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