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Regulatory Matters: CPUC Rehearing Matter and Procurement Audits (Details) - Golden State Water Company - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Regulatory matters:
Net Regulatory Assets	$ (21,636)	$ 2,042
Water Revenue Adjustment Mechanism [Member]
Regulatory matters:
Net Regulatory Assets	3,400
General rate case memorandum accounts
Regulatory matters:
Net Regulatory Assets	$ 6,798	$ 10,522

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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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