Income Tax (tables)

3 Months Ended

Mar. 31, 2012

Income Tax Expense Benefit Abstract

Effective Tax Rate Reconciliation

		March 31,
		2012		2011
Federal statutory tax rate		35.0	%	35.0	%
Increase (decrease):
	Current state income tax, net of federal tax benefit	4.6	%	4.6	%
	Amortization of investment and energy tax credits	(0.3)	%	(0.4)	%
	Differences required to be flowed-through by regulatory commissions	1.6	%	1.5	%
	Gains on company and trust-owned life insurance	(0.4)	%	(0.2)	%
	Other - net	0.2	%	0.1	%
Effective income tax rate		40.7	%	40.6	%