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Income Tax (details)	3 Months Ended
Income Tax (details)	Mar. 31, 2013	Mar. 31, 2012
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal Statutory Tax Rate	35.00%	35.00%
Current State Income Tax, Net Of Federal Tax Benefit	4.70%	4.60%
Amortization Of Investment And Energy Tax Credits	(0.30%)	(0.30%)
Differences Required To Be Flowed Through By Regulatory Commissions	2.40%	1.60%
Gains On Company And Trust Owned Life Insurance	(0.30%)	(0.40%)
Other - Net	(0.70%)	0.20%
Effective Income Tax Rate	40.80%	40.70%

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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