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Derivative Instruments (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) MWh | Jun. 30, 2020 USD ($)
Commodity Contract |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair value at end of the period | $ (2,800) |  | $ (2,800) |
GOLDEN STATE WATER COMPANY |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Description of derivative activity volume | MWh |  |  | 417,649 |
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 | 1,224 | $ (4,280) | $ (1,537) | $ (3,171)
Unrealized gains (losses) on purchased power contracts | 1,586 | 453 | 4,347 | (656)
Fair value at end of the period | $ 2,810 | $ (3,827) | $ 2,810 | $ (3,827)

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- Definition Amount of unrealized gain (loss) recognized in income for derivative asset (liability) after deduction of derivative liability (asset), measured at fair value using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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