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Fair Value of Financial Instruments: (Tables) | 9 Months Ended
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Sep. 30, 2018
Fair Value Disclosures [Abstract] |
Schedule of estimates of the fair value of long-term debt | The table below estimates the fair value of long-term debt held by GSWC. The fair values as of September 30, 2018 and December 31, 2017 were determined using rates for similar financial instruments of the same duration utilizing Level 2 methods and assumptions. The interest rates used for the September 30, 2018 valuation increased as compared to December 31, 2017, decreasing the fair value of long-term debt as of September 30, 2018. Changes in the assumptions will produce different results.
|  | September 30, 2018 |  | December 31, 2017
(dollars in thousands) |  | Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Financial liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt—GSWC (1) |  | $ | 324,978 |  |  | $ | 389,438 |  |  | $ | 325,265 |  |  | $ | 424,042 |

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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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