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Derivative Instruments (Tables) (GOLDEN STATE WATER COMPANY) | 3 Months Ended
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Mar. 31, 2015
GOLDEN STATE WATER COMPANY |
Derivative Instruments, Gain (Loss) [Line Items] |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation | The following table presents changes in the fair value of GSWC’s Level 3 derivatives for the three months ended March 31, 2015 and 2014:
(dollars in thousands) |  | 2015 |  | 2014
Fair value at beginning of the period |  | $ | (3,339 | ) |  | $ | — |
Unrealized loss on purchased power contracts |  | (2,837 | ) |  | — |
Fair value at end of the period |  | $ | (6,176 | ) |  | $ | — |

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