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Income Taxes: (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
GOLDEN STATE WATER COMPANY
Effective income tax rate
ETRs (as a percent)	25.90%	23.40%	24.70%	22.20%
Parent [Member]
Effective income tax rate
ETRs (as a percent)	24.40%	22.60%	23.50%	21.90%

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- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

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