Principles Of Preparation (Depreciation) (Details) - Public Utilities, Regulatory Rate Making Impact - PUCT - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
	Aug. 25, 2016	Sep. 30, 2016	Sep. 30, 2016
Property, Plant and Equipment [Line Items]
Decrease in Depreciation Expense	$ 8,500	$ 7,400	$ 7,400
Expected Decrease In Depreciation Expense			$ 9,500