Income Tax (details)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
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	4.60%	4.60%
Amortization Of Investment And Energy Tax Credits	(0.30%)	(0.40%)
Differences Required To Be Flowed Through By Regulatory Commissions	1.60%	1.50%
Gains On Company And Trust Owned Life Insurance	(0.40%)	(0.20%)
Other - Net	0.20%	0.10%
Effective Income Tax Rate	40.70%	40.60%