Regulation (Refund Fuel Cost Over Recoveries) (Details) (USD $) In Thousands, unless otherwise specified	May 12, 2010 PUCT Docket No. 38253	Oct. 20, 2010 PUCT Docket No. 38802	Feb. 18, 2011 PUCT Docket No. 39159
Refund Amount	$ 11,100	$ 12,800	$ 11,800