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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 [Abstract]
Unrealized gain (loss) on available-for-sale security, deferred tax	$ 45	$ 24
Amortization of actuarial loss included in expense, deferred tax	$ 1,858	$ 1,011

Tax effect on the accumulated change in the value of either the projected benefit obligation or plan assets resulting from experience different from that assumed or from a change in an actuarial assumption that has not been recognized in net periodic benefit cost.

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