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Derivative Instruments (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) MWh | Sep. 30, 2019 USD ($)
Commodity Contract |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Fair value at end of the period | $ 2,500 |  |  | $ 2,500 |
GOLDEN STATE WATER COMPANY |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Description of derivative activity volume | MWh |  |  |  | 528,442 |
GOLDEN STATE WATER COMPANY | Minimum | Commodity Contract |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Term of derivative contract |  | 3 years |  |  |
GOLDEN STATE WATER COMPANY | Maximum | Commodity Contract |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Term of derivative contract |  | 5 years |  |  |
Bear Valley Electric Service, Inc. | Commodity Contract |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Fair value at beginning of the period | (3,827) | $ (3,022) | $ (267) | $ (3,171) | $ (311)
Unrealized gains (losses) on purchased power contracts | 1,309 |  | (2,755) | 653 | (2,711)
Fair value at end of the period | $ (2,518) | $ (3,171) | $ (3,022) | $ (2,518) | $ (3,022)

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