Nature Of Operations And Summary Of Significant Accounting Policies (Depreciation Provisions For Utility Plant As A Percentage Of The Original Cost) (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Electric Operations [Member]
Basis Of Accounting Presentation [Line Items]
Depreciation provisions for utility plant, percentage	3.00%	3.20%	3.40%
Gas Distribution Operations [Member]
Basis Of Accounting Presentation [Line Items]
Depreciation provisions for utility plant, percentage	1.80%	1.80%	1.90%