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Fair Value of Financial Instruments: (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Golden State Water Company | Carrying Amount
Financial liabilities:
Long-term debt - GSWC	$ 324,978	$ 325,265
Golden State Water Company | Fair Value
Financial liabilities:
Long-term debt - GSWC	389,438	$ 424,042
Mutual Funds | Fair Value, Inputs, Level 1
Financial liabilities:
Rabbi trust fair value of investments held	$ 17,800

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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)(1))
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-Name Accounting Standards Codification
-Topic 942
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-Section S99
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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