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Summary of Significant Accounting Policies: (Details) customer in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) customer registrant	Jun. 30, 2014 USD ($)	May. 31, 2013 USD ($)
Basis of Presentation:
Number of registrants filing combined report | registrant			2
Related Party Transactions
Amounts outstanding under note	$ 3,000,000		$ 3,000,000
Sales and Use Taxes:
Non-income tax assessments accounted on a gross basis	4,060,000	$ 3,965,000	8,336,000	$ 8,290,000
Debt Issuance Cost	5,000,000		5,000,000
AWR | Promissory Note
Related Party Transactions
Debt instrument, face amount					$ 20,000,000.0
Debt instrument, maximum borrowing capacity					$ 20,000,000.0
AWR | Syndicated Credit Facility
Related Party Transactions
Maximum borrowing capacity on line of credit	100,000,000		100,000,000
GOLDEN STATE WATER COMPANY
Related Party Transactions
Payments to affiliate for corporate office administrative and general costs	609,000	677,000	1,316,000	1,373,000
Sales and Use Taxes:
Franchise fees billed to customers and recorded as operating revenue	996,000	975,000	1,900,000	1,800,000
Non-income tax assessments accounted on a gross basis	3,748,000	3,530,000	$ 7,666,000	7,426,000
GOLDEN STATE WATER COMPANY | Purchase, production, distribution and sale of water
Nature of Operations:
Number of customers served | customer			258
GOLDEN STATE WATER COMPANY | Electricity distribution
Nature of Operations:
Number of customers served | customer			24
ASUS
Sales and Use Taxes:
Non-income tax assessments accounted on a gross basis	$ 53,000	$ 157,000	$ 86,000	$ 306,000
ASUS | Contracts
Nature of Operations:
Period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases			50 years
Sales and Use Taxes:
Period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases			50 years
Sales | GOLDEN STATE WATER COMPANY | Purchase, production, distribution and sale of water
Nature of Operations:
Percentage of total revenue			90.00%

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