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Contingencies and Gain on Sale of Assets Loss Contingencies Number of Customer Served (Details)		6 Months Ended
	Jun. 08, 2017 USD ($)	Jun. 30, 2017 customer
Condemnation of Properties | GOLDEN STATE WATER COMPANY | City of Claremont
Loss Contingencies [Line Items]
Loss contingency number of customers served | customer		11,000
Ojai Water System
Loss Contingencies [Line Items]
Loss contingency number of customers served | $	2,900

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