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Balancing and Memorandum Account Recovery Procedures (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Balancing and Memorandum Account Recovery Procedures [Abstract]    
Balancing and Memorandum Account, Net $ 7,725  
Balancing and Memorandum Accounts, Revenue and Regulatory Assets $ 411 $ 1,885
Threshold as a percentage of authorized revenue for balancing account or memorandum account review 2.00%