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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-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

Name:	us-gaap_EffectiveIncomeTaxRateContinuingOperations
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Income Taxes: (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Income Taxes: (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
GOLDEN STATE WATER COMPANY
Effective income tax rate
ETRs (as a percent)	38.40%	38.20%	38.60%	38.30%
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	$ 288		$ 989
Consolidated Entities [Member]
Effective income tax rate
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	$ 279		$ 1,019
Parent [Member]
Effective income tax rate
ETRs (as a percent)	37.30%	37.00%	37.30%	37.10%