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Regulatory Matters: Alternative-Revenue Programs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jul. 01, 2019	May 30, 2019	Dec. 31, 2018
Water Revenue Adjustment Mechanism and Modified Cost Balancing Account
Regulatory matters:
Increase (decrease) in other regulatory assets			$ 16,400
GOLDEN STATE WATER COMPANY
Regulatory matters:
Regulatory assets	$ (13,284)		$ (13,284)				$ (28,340)
GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism and Modified Cost Balancing Account
Regulatory matters:
Commercial paper, term			90 days
Amount billed to customers as surcharges	832	$ 5,600	$ 3,600	$ 9,800
Regulatory assets	30,522		$ 30,522				$ 17,763
GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism and Modified Cost Balancing Account | Minimum
Regulatory matters:
Regulatory Asset Recovery Periods			12 months
GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism and Modified Cost Balancing Account | Maximum
Regulatory matters:
Regulatory Asset Recovery Periods			24 months
GOLDEN STATE WATER COMPANY | WRAM
Regulatory matters:
Regulatory assets						$ 20,400
GOLDEN STATE WATER COMPANY | Modified Cost Balancing Account
Regulatory matters:
Regulatory assets	$ 10,800		$ 10,800
Subsequent Event [Member] | Water Service Utility Operations [Member] | Revenue Subject to Refund for TCJA [Member]
Regulatory matters:
Regulatory assets					$ (7,200)

X

- Definition

Represents the term associated with a fixed-term security.

+ References

No definition available.

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- Definition

Represents amount billed to customers as surcharges.

+ References

No definition available.

+ Details

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- Definition

Represents the recovery periods of the surcharge billed to the customers.

+ References

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- Definition

-- None. No documentation exists for this element. --

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- Definition

The increase (decrease) during the reporting period in the value of other assets that are created when regulatory agencies permits public utilities to defer costs to the balance sheet.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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- Definition

The net amount of all regulatory assets less all regulatory liabilities as of the end of the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382

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