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Contingencies: (Details) (USD $) In Millions, unless otherwise specified | 0 Months Ended | 6 Months Ended
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Mar. 08, 2013 Barstow Perchlorate Contamination production_wells lawsuits | Jun. 30, 2013 Environmental Clean-Up and Remediation GSWC | Jun. 30, 2013 City of Claremont Condemnation of Properties GSWC customer | Jun. 30, 2013 Ojai FLOW Condemnation of Properties GSWC customer | Jun. 30, 2013 Santa Maria Valley Water Conservation District GSWC acrefeet
Contingencies |  |  |  |  |
Number of toxic tort lawsuit served | 4 |  |  |  |
Number of active production wells for which lawsuits served | 1 |  |  |  |
Number of customers served through water systems |  |  | 11,000 | 3,000 |
Area of groundwater replenishment provided (in acre-feet) |  |  |  |  | 10,000
Percentage of the return flows generated from importation of state water project to be recaptured |  |  |  |  | 45.00%
Amount spent in clean-up and remediation activities |  | $ 3.5 |  |  |
Amount paid by the State of California Underground Storage Tank Fund for clean-up and remediation of plant facilities |  | 1.5 |  |  |
Accrued liability for the estimated additional cost to complete the clean-up at the site |  | $ 1.2 |  |  |

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