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Balancing and Memorandum Account Recovery Procedures (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Aug. 21, 2013	Dec. 31, 2012	Jan. 03, 2012	Oct. 27, 2010
Balancing and Memorandum Account Recovery Procedures [Abstract]
Balancing Account, Net	$ 7,430		$ 7,430			$ 6,314
Requested Recovery of Under-Collected Balance Accounts							2,599
Memorandum Account, Net	1,437		1,437			1,486
Amount of net over-collection requested to be refunded to customers							650
Balancing and Memorandum Account, Net	5,993		5,993
Balancing and Memorandum Accounts, Revenue and Regulatory Assets	1,761	584	5,320	584
Threshold as a percentage of authorized revenue for balancing account or memorandum account review	2.00%		2.00%
Immediate increase requested percent of authorized revenue								38.00%
Increase requested percent of authorized revenue								71.00%
Increase percent of authorized revenue approved					33.00%
Customer refund for over rate collections	982
Customer refund reduction in revenue	$ 36		$ 982

X

- Definition

This represents the under-collection or over-collection associated with expense changes and the revenue authorized by the CPUC to offset those expense changes. Pursuant to Section 792.5 of the California Public Utilities Code, a balancing account must be maintained for expense items for which revenue offsets have been authorized. Since the amounts in the balancing accounts must be approved by the CPUC before they can be incorporated into rates, the Company does not recognize balancing accounts in its revenue until CPUC approval occurs. It is typical for the CPUC to incorporate any over-collected and/or under-collected balances in balancing accounts into customer rates at the time rate decisions are made as part of the Company’s general rate case proceedings by assessing temporary surcredits and/or surcharges.

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No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Balancing and Memorandum Account, Net

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No definition available.

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- Details

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- Definition

Threshold balance of a balancing or memorandum account as a percentage of authorized revenue to trigger an account review.

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No definition available.

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X

- Definition

Balancing and Memorandum Accounts, Revenue and Regulatory Assets

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No definition available.

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- Definition

Customer Refund for Over Rate Collections

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No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Customer Refund, Reduction in Revenue

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Balance Type:	debit
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X

- Definition

This represents the memorandum accounts that track under-collection or over-collection for approved activities as directed by the CPUC. Rate recovery for these memorandum accounts is generally allowed in the next general rate cases.

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No definition available.

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Balance Type:	credit
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- Definition

A request to the regulatory authority for authorization to refund over-collected amounts.

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No definition available.

+ Details

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Balance Type:	credit
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- Definition

Regulatory Rate Filings, Immediate Increase Requested, Percentage

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No definition available.

+ Details

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- Definition

Regulatory Rate Filings, Increase, Percent of Authorized Revenue Approved

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- Definition

Regulatory Rate Filings, Total Increase Requested, Percentage

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- Definition

Regulatory Rate Filings, Requested Recovery of Under-Collected Balance Accounts

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