Statements Of Consolidated Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Unrealized gain on available-for-sale security, net of deferred tax	$ 0	$ 182	$ 0	$ 145
Net actuarial loss included in net periodic benefit expense or income, net of deferred tax	1,892	1,988	5,672	5,982
Amortization of prior service cost or credit included in net periodic benefit expense or income, net of deferred tax	$ 61	$ (116)	$ 184	$ (349)