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Business Segments: (Details 2) (USD $)	3 Months Ended
Business Segments: (Details 2) (USD $)	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Details of reportable segment
Total utility plant	$ 929,538,000	$ 897,835,000	$ 917,791,000
Other assets	359,976,000	348,794,000
Total Assets	1,289,514,000	1,246,629,000	1,280,943,000
GOLDEN STATE WATER COMPANY
Details of reportable segment
Depreciation on transportation equipment	250,000	577,000
Total utility plant	924,826,000		913,137,000
Total Assets	$ 1,226,966,000		$ 1,214,052,000

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.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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