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Derivative Instruments (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) MWh	Sep. 30, 2020 USD ($)
Commodity Contract
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at end of the period	$ (7,900)		$ (7,900)
GOLDEN STATE WATER COMPANY
Derivative Instruments, Gain (Loss) [Line Items]
Description of derivative activity volume | MWh			387,821
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	2,810	$ (3,827)	$ (1,537)	$ (3,171)
Unrealized gains on purchased power contracts	5,065	1,309	9,412	653
Fair value at end of the period	$ 7,875	$ (2,518)	$ 7,875	$ (2,518)

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Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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

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Fair value of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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