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Statements of Consolidated Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Statements of Consolidated Comprehensive Income
Net unrealized losses on securities arising during the period, taxes (tax benefits)	$ 149	$ 414
Net unrealized holding losses arising during the period, taxes (tax benefits)		6
Less: reclassification adjustment to net income, taxes (tax benefits)	37	3
Less: amortization of net loss, prior service gain and transition obligation included in net periodic benefit cost, taxes (tax benefits)	2,473	631
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, taxes (tax benefits)	$ 2,162	$ 1,431

Tax effect on reclassification adjustment for accumulated gains and losses from derivative instrument designated and qualifying as the effective portion of cash flow hedges included in accumulated comprehensive income that was realized in net income during the period.

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- Definition

Tax effect on the change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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- Definition

Tax effect on gross appreciation or the gross loss in value of the total of unsold securities during the period being reported on.

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