Income Tax (details)	6 Months Ended
	Jun. 30, 2011	Jun. 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	1.60%	1.40%
Gains On Company And Trust Owned Life Insurance	(0.60%)	(0.40%)
Other - Net	0.30%	0.10%
Effective Income Tax Rate	40.40%	40.50%