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Derivative Instruments (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) MWh	Mar. 31, 2020 USD ($)
Commodity Contract
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at end of the period	$ 1,200
GOLDEN STATE WATER COMPANY
Derivative Instruments, Gain (Loss) [Line Items]
Description of derivative activity volume | MWh	445,573
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	$ (1,537)	$ (3,171)
Unrealized gains (losses) on purchased power contracts	2,761	(1,109)
Fair value at end of the period	$ 1,224	$ (4,280)

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Derivative Activity Volume

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- Definition

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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258

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