Income Tax (details)	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
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	4.50%	4.80%
Amortization Of Investment And Energy Tax Credits	(0.40%)	(0.40%)
Differences Required To Be Flowed Through By Regulatory Commissions	1.50%	1.20%
Gains On Company And Trust Owned Life Insurance	(0.90%)	(0.80%)
Other - Net	0.70%	0.50%
Effective Income Tax Rate	40.40%	40.30%