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Business Segments: (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Details of reportable segment
Income tax expense (benefit)	$ 6,939	$ 12,508	$ 13,890	$ 33,670
Net property, plant and equipment	1,262,915	1,181,616	1,262,915	1,181,616	$ 1,204,992
Other assets	202,127	304,870	202,127	304,870
Total Assets	1,465,042	1,486,486	1,465,042	1,486,486	1,416,734
Golden State Water Company
Details of reportable segment
Income tax expense (benefit)	5,414	10,813	11,743	29,235
Depreciation on transportation equipment	58	$ 61	179	$ 181
Net property, plant and equipment	1,249,190		1,249,190		1,197,940
Total Assets	$ 1,364,729		$ 1,364,729		$ 1,326,823

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets except utility plant that are recognized.

+ References

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- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of transportation equipment over the assets' useful lives.

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- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
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- Definition

Amount 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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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