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Subsequent Event (Details) (USD $) In Thousands, unless otherwise specified			9 Months Ended		0 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Cibolo Canyons Project [Member]	Sep. 30, 2013 Cibolo Canyons Project [Member]	Oct. 24, 2014 Subsequent Event [Member] Cibolo Canyons Project [Member]	Oct. 24, 2014 Subsequent Event [Member] Cibolo Canyons Project [Member]
Subsequent Event [Line Items]
Collection related to reduction of investment in the mixed-use development			$ 4,050	$ 2,700	$ 46,500
Long-term Transition Bond						48,900
Letters of credit						10,000
Letters of Credit Outstanding, Amount						6,846
Real estate, net	$ 591,805	$ 519,464	$ 24,067

Long-Term transition bonds are bonds under the Competition Act in which the proceeds of Transition Bonds are required to be used principally to reduce qualified stranded costs and the related capitalization of the utility. This represents the current and noncurrent portions. The initial maturity is beyond one year or beyond the normal operating cycle, if longer.

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